The invention discloses an organic fertilizer drying system. The organic fertilizer drying system comprises a first material extrusion device, a second material extrusion device and a drying device. The first material extrusion device comprises a vertically-arranged first barrel, a first spiral feeding mechanism arranged in the first barrel and a material disc which is arranged on the lower portion of the first barrel in a covering manner and relatively fixed with the first barrel. The second material extrusion device is arranged below the first material extrusion device and comprises a horizontally-arranged second barrel, a second spiral feeding mechanism arranged in the second barrel and a conic funnel arranged at the second end of the second barrel in a sleeving manner. Multiple flow guide grooves are formed in the outer surface of the conic funnel, the flow guide grooves are spirally coiled on the outer surface of the conic funnel, and the cross section of each flow guide groove issemicircular. The drying device is arranged at the second end of the second baffle and receives materials of a discharging opening. The drying device comprises a rotary barrel, a heating plate arranged in the rotary barrel and a driver driving the rotary barrel and the heating plate to independently rotate.