The invention relates to the field of cow feces treatment, in particular to a dairy cow feces separating device which comprises a separating mechanism and a recycling mechanism. The recycling mechanism is arranged on one side of the separating mechanism. The separating mechanism comprises at least one puncher pin and a placement base. The upper end of the placement base is provided with a groove matched with the puncher pin. The cross section of the puncher pin is smaller than that of the groove. The upper end of the puncher pin is connected with an air cylinder. The bottom end of the groove is provided with a water through hole. The lower end of the placement base is provided with a water collection cavity communicated with the water through hole. A piece of gauze for containing feces is arranged in the groove and is in a closed ball shape. The recycling mechanism comprises a sewage pool communicated with the water collection cavity. The water outlet position of the water collection cavity is higher than the water inlet position of the sewage pool. According to the dairy cow feces separating device, cow dung, sewage and cow urine are thoroughly separated, the separation effect is good, and the water through hole will not be blocked.