Abstract: The grain drying monitoring system can monitor the temperature, humidity and other key parameters in the drying process in real time to ensure that the grain reaches the ideal moisture content during the drying process, so as to ensure product quality and food safety. In order to improve the efficiency of corn drying and monitor the process of corn drying, this paper proposes the design of a DCS-based automatic monitoring system for corn drying, which designs the input module, monitoring module and output module, establishes a real-time monitoring and alarm mechanism, and at the same time combines with the advanced automation control technology, which can effectively improve the drying efficiency, reduce the energy consumption and improve the production quality, and has important application value and It has important application value and promotion prospect.