Granulating device for biological fertilizer production

The utility model provides a granulating device for biological fertilizer production. The granulating device comprises a rack, wherein a rolling roller group, a crushing roller group and a screen are sequentially arranged on the rack in the perpendicular direction, the rolling roller group comprises a rolling roller I and a rolling roller II which rotate in opposite directions, the crushing roller group comprises a crushing roller I and a crushing roller II, two ends of the rolling roller I and two ends of the crushing roller I are fixedly connected with the rack through mounting frames I respectively, two ends of the rolling roller II and two ends of the crushing roller II are mounted on mounting frames II respectively, guide bulging strips are arranged at lower ends of the two mounting frames II, horizontal guide rails matched with the guide bulging strips are arranged on the rack, motors are mounted on the rack and are in driving connection with screw rods, the screw rods penetrate through U-shaped supports, and two ends of each U-shaped support are fixedly connected with the corresponding mounting frame II respectively. According to the granulating device, different models of rolling rollers can be changed according to biological fertilizers with different grain sizes, so that the production cost can be effectively reduced.