Slow release fertilizer coating spraying device

A slow-release fertilizer coating spraying device comprises a roller, the two ends of the roller are assembled in a head cover and a tail cover respectively, the head cover is communicated with a hopper through a feeding pipe, the tail cover is communicated with a discharging pipe, a plurality of material guiding plates are arranged in the roller, a spraying pipe is arranged in the roller, a plurality of spraying heads are communicated with the spraying pipe, one end of the spraying pipe is communicated with a stirring tank, and the other end of the spraying pipe is communicated with a discharging pipe. A temperature sensor and a first infusion pump are installed at the two ends of the spraying pipe respectively, the material groove A and the material groove B are communicated with the stirring tank through feeding pipes respectively, a second infusion pump and a flowmeter are installed on the feeding pipes, the temperature sensor and the flowmeter are connected with the input end of a controller, and the fir