Abstract: China has a large population and food safety is important to people's livelihood. The recurring food safety problems in recent years are worth thinking about. It is an urgent problem to address food safety issues. The establishment of food safety traceability system is an extremely effective measure to deal with food safety problems. It can solve the security problems in the information field, reduce the risk of harm and give consumers a real sense of security. However, there are still some deficiencies in the existing food safety traceability system, including adverse selection, resource waste and trust crisis caused by information asymmetry, and blockchain technology can just solve most of these problems. With the development of information technology and the improvement of digital infrastructure, the value of data information is being gradually mined. The combination of blockchain technology and food safety traceability is the important achievement of "Internet+", and the control and development of food safety traceability technology would stride over a new level.