This system enables fully automatic temperature and humidity control for grain warehouses. It integrates grain condition monitoring, multi-functional ventilation pipelines, grain coolers, on-site controllers, and a cloud control platform. It collects real-time data of grain status, indoor and outdoor temperature & humidity, then automatically switches ventilation routes and adjusts supply air parameters to cool the warehouse and grain bulk. All data is uploaded to the cloud platform for AI analysis. The system eliminates delays caused by manual operation and prevents ineffective or excessive ventilation. It cuts labor costs, reduces grain loss, and saves energy, making it an ideal solution for modern smart grain storage.