The invention discloses a commercial kitchen wastes dewatering machine. The commercial kitchen wastes dewatering machine comprises a dewatering shell body and a dewatering mechanism which is arranged in the dewatering shell body. A material discharging port of wastes are formed in the upper end part of the dewatering shell body and a material feeding port, which communicates with the material discharging port, of the wastes is formed in the lower end part of the dewatering shell body. The dewatering mechanism comprises a spiral blade and a dewatering motor. The spiral blade used for squeezing the wastes is rotationally connected into the dewatering shell body and the dewatering motor is connected with the spiral blade in a transmission manner. According to the commercial kitchen wastes dewatering machine, the kitchen wastes are subjected to dewatering treatment and the moisture is controlled from the source, so that the collecting process and the conveying process of the kitchen wastes can be effectively shortened and not only that the dewatering rate is high and the energy consumption is low.