Ensuring food security requires not only increasing production but also reducing food loss and waste (FLW). In recent years, China's total grain production has continuously reached a new high, but the problem of FLW is still prominent. The control of FLW reduction also still needs in-depth development. The development of digital technology plays an important role in FLW reduction. This paper has briefly reviewed the current situation of FLW reduction and the application of digital technology in food supply chain, and analyzed the pathway of digital technology in FLW reduction from four fields of food production, food circulation, food sales and consumption. It also proposes corresponding countermeasures and suggestions for China's work on FLW reduction. In order to further leverage the role of digital technologies in FLW reduction of all links of the food supply chain, efforts should be made to improve the monitoring and assessment of FLW and establish a regular FLW investigation system. Policy guidance should be strengthened to establish and improve the long-term management mechanism of FLW. The digital literacy and skills of all subjects in the food supply chain should be cuitivated to promote the soft power of FLW with the digital technology management. Leverage digital technologies to promote grain conservation and loss reduction by addressing each link in the grain supply chain.