The invention discloses a grain dispersing device. The grain dispersing device structurally comprises a driver, a belt cover, a belt, a motor, a feeding hopper, a main body, a dispersing device body,a heating device, a supporting frame, a guide groove, a rotary knob, a first dispersing opening, a second dispersing opening, a fixed rod, a controller and a wire; the belt cover and the motor are connected, the belt is arranged in the belt cover, the main body is connected with the supporting frame, the dispersing device body is arranged in the main body, the supporting frame is fixedly connectedwith the fixing rod, the rotary knob is movably connected with the main body, the first dispersing opening is formed in the lower portion of the main body, the second dispersing opening is fixedly connected with the guide groove, the fixing rod is connected with the main body through the supporting frame, the controller is arranged below the main body. When an existing grain dispersion device carries out dispersing on grain, the grain cannot be dried, manual secondary processing is needed, and work efficiency is reduced.