Drying control device for compound granular fertilizer

The utility model discloses a compound granular fertilizer drying control device which comprises a drying roller, a circulating fan and a controller, a temperature and humidity sensor is arranged in the drying roller, and the signal output end of the temperature and humidity sensor is connected with a data acquisition module through a transmission line. The data acquisition module comprises a low-pass amplifier, a voltage-stabilizing filter and an analog-to-digital converter, the temperature and humidity sensor is arranged in the drying roller to acquire temperature and humidity data of materials, and the controller judges whether the compound granulated fertilizer reaches the drying standard according to the real-time temperature and humidity data; and the heating furnace and the circulating fan are turned off when the humidity data of the compound granulated fertilizer reaches a standard value, so that the drying process of the compound granulated fertilizer is automatically adjusted, the energy consumption