The invention provides a pelletizing device for producing an organic fertilizer. The pelletizing device comprises a base plate, a top plate, a pelletizing barrel, a motor, an infusion pump, an air cylinder, a connecting plate and a screen frame; the pelletizing device is characterized in that the base plate is arranged on a bracket; a storage tank is arranged on the base plate; slide rails are arranged between the vertical plate and the vertical plate; connecting shafts are arranged at the two ends of the pelletizing barrel; the motor is arranged on the top plate; the infusion pump is arrangedon the top plate; the air cylinder is arranged on the vertical plates; the connecting plate is arranged on a piston rod; the screen frame is arranged between the slide rail and the slide rail; meshesare formed in the screen frame. According to the invention, the screen frame is arranged as a structure capable of moving between the slide rail and the slide rail; the pelletized organic fertilizerfalls into the topmost screen frame through a material port in the pelletizing barrel; the screen frame moves between the slide rail and the slide rail under the effects of the air cylinder, the piston rod, the connecting plate and the connecting rod, so as to screen the organic fertilizer grains in the screen frame; the quality of the organic fertilizer after being pelletized is promoted.