Nowadays the digital technology led by technological enhancement has revolutionized the traditional industries, and pushed the world into an intelligent era of data-driven decision-making. Scientific innovation and digital transformation have given the grain industry new kinetic energy to accelerate the high-quality development, which is an important foundation for ensuring grain security. In the paper, we discussed the connotation and values of digitalization of food security from two aspects: daily food supply chain security and emergency food security. On the one hand, the digital technology plays a critical role in strengthening information sharing and interaction between multiple agents in the production, transportation, storage, processing and consumption of daily food supply chain, which made contribution to refining grain production and promoted the dynamic balance of food supply and demand. On the other hand, the digital technology is able to capture the detailed logic and randomness of the system, which is of great theoretical and application value for establishing the grain security management model in emergencies. It can effectively improve grain reserve capacity, optimize grain reserve layout, strengthen grain warning capabilities, achieve a dynamic balance between supply and demand of grain, improve grain emergency supply guarantee capacity, and achieve coordinated regional grain scheduling. The paper helps build a digital platform for grain emergencies, promotes intelligent decision-making in grain emergencies, which could support the digital construction of food security in China in the information age.