The invention discloses a cow dung collection device. The cow dung collection device comprises a dung discharge channel, a screw and a dung pool, wherein the screw is arranged in the dung discharge channel, and the dung pool is arranged at the left end of the dung discharge channel. The cow dung collection device is characterized in that a water tank is arranged at the right end of the dung discharge channel, the upper end of the dung discharge channel is provided with a water discharge channel which inclines towards the water tank, a retaining plate is arranged on the upper portion of the water discharge channel, two ends of the retaining plate are connected with a foundation through a rotating shaft, an inclined control rod is arranged at the end of the retaining plate, the rotating shaft is arranged on the right side of the center of the retaining plate, the upper portion of the retaining plate is provided with a water discharge brim, the right end of the retaining plate is flush with the upper side of the water discharge channel, and the left end of the water discharge brim is provided with grooves in uniform distribution. The cow dung collection device has advantages that cow dung and floor flushing wastewater can be discharged into the dung pool and the water tank respectively, on the one hand, cow dung airing time is shortened, and airing sites is saved; on the other hand, wastewater with a small quantity of fine cow dung can be directly used for irrigation, so that water is saved greatly.