With the rapid development of technology, intelligence has become an important direction for the transformation and upgrading of various industries. Since 2018, China has comprehensively accelerated the intelligent construction of grain depots, and the informatization and intelligence of grain depots have become a trend in the current industry, which is an inevitable way to ensure national food security and improve quality and efficiency. Based on the current situation and development needs of China's grain storage, this paper summarizes the technology application in the construction of smart grain storage, including sensor and Internet of things technology, automatic control technology, big data analysis and decision making, cloud computing technology, etc; The application scenarios of smart grain depot in grain purchase and storage, inventory quantity monitoring, intelligent security and so on are introduced. The problems existing in its application and construction are analyzed. In view of the new requirements of the smart grain depot for construction management, grain storage facilities and equipment and grain storage technology, the future development suggestions were put forward to provide reference for the comprehensive construction of China's smart grain depot.