In 2020, the epidemic black swan swept across China, and all walks of life suffered a huge blow. After half a year of epidemic prevention and anti-epidemic battles, the epidemic situation gradually improved and the country resumed work and production. As everyone relaxed their vigilance, the outbreak in Xintiandi in Beijing rebounded, followed by Xiamen, Dalian, Chongqing, Yunnan, Shenzhen and other places. The rebound was caused by food or food packaging carrying the new crown virus. The rebound of the new crown epidemic is fierce, the food industry has been pushed to the forefront, and the country has paid more attention to food safety. In the 'Measures for the Administration of Commodity Barcodes' officially implemented on October 1, 2005, it is clearly stated that food packaging products should be marked with commodity barcodes in the product label. Secondly, Article 42 of the Food Safety Law also clearly stipulates that food producers and operators should establish a food safety traceability system to ensure food traceability. Food traceability has always been a key focus of the country and the food industry. In order to effectively reduce the occurrence of food safety incidents, on December 30, 2015, the General Office of the State Council issued the 'Opinions of the General Office of the State Council on Accelerating the Establishment of a Traceability System for Important Products' '. The opinions pointed out that the construction of the traceability system is an effective measure to collect and record information about product production, circulation, consumption and other links, to realize the source can be found, whereabouts can be traced, and the responsibility can be investigated, and to strengthen the quality and safety management and risk control of the whole process. Food traceability is the use of the Internet of Things technology to collect food data information, linear traceability from production to sales, and investigations in all aspects of food safety. Consumers can grasp the production, delivery, ingredients, date of use, and quality of food during the traceability process. Information such as inspection certificates and logistics vouchers can protect consumers' rights and interests to the greatest extent and maintain market order. Since multiple cases of frozen imported food, non-frozen imported food, and food packaging were detected in July and August that carry the new coronavirus, the construction of the food traceability system has been pushed to a climax again. All regions are in order to protect the health of the people and eliminate the dangers caused by the new coronavirus caused by food. Possibly, all regions have accelerated the pace of product traceability construction. In the construction of food traceability system, two-dimensional traceability source code and traceability barcode are essential food identification. Consumers can obtain all information from food production to sale by scanning barcodes and traceability source codes, thereby protecting their own interests. The two-dimensional traceable source code and the traceable barcode are unique and cannot be copied, and each food has its own traceable source code and barcode, which is what people often say is one code for each item. It is worth mentioning that in the process of building a food traceability system, the coding and marking equipment also plays an important role. The most direct manifestation lies in the printing of the traceability source code and barcode. The coding and marking equipment assigns the traceable source code to the food. Consumers only need to scan the code to query the traceable source code of the fresh food, and they can find all the traceability information in the whole life cycle of the fresh food, including manual input of production, circulation or sales. Information also includes the sensing data information automatically collected by the sensing device. In addition to fresh and live foods without additives, there are also some snack foods with additives that need to be printed and traced to the source code. For the labeling of such snack foods, Article 21 of the 'Food Hygiene Law of the People's Republic of China' clearly stipulates: finalization Packaged foods and food additives must be marked on the packaging label or product manual. The production date and shelf life of different products must be marked in accordance with the regulations. The packaging label must be clear and easy to identify. Therefore, clarity and visibility are essential conditions for food packaging labeling, as well as the key to judging whether the food complies with laws and regulations and whether it has traceability, and the quality of the printing directly determines the effectiveness of the packaging labeling information. Food packaging materials are different, including metal cans, glass bottles, paper containers, plastic, PET bottles, vacuum cartons, corrugated boxes and other packaging materials. Different packaging materials have different requirements for the material adaptability of the printing and marking equipment. . The coding and marking equipment can print patterns, trademarks, texts and other permanent marks on products and product packaging through different print heads. Coding marking equipment can print production date, shelf life, production batch number, manufacturer name and other information signs on food packaging of various specifications for consumers to inquire and protect consumer rights. When printing, the coding and marking equipment does not directly touch the surface of the article, and will not damage the food itself and the food packaging, and the printed marking has the characteristics of high adhesion, abrasion resistance, clear and obvious characteristics, which can ensure the food circulation link The long-term availability of middle traceable barcode and two-dimensional traceable source code meets the national requirements for food labeling. Relying on the advantages of stable performance, high reliability, fast speed, and low power consumption, coding and marking equipment has become increasingly widely used in the food industry. As an effective means to improve the safety of food traceability and to recall low-quality food efficiently and accurately, the coding and marking industry can improve the ability of manufacturers and governments to trace food at any link in the supply chain, and help government management departments to achieve source traceability, whereabouts traceability, and responsibility The research purpose is to promote the high-quality and green development of the food industry.