The invention provides a storehouse cleaning robot system for a cement storehouse. The storehouse cleaning robot system comprises a storehouse cleaning robot and a sliding track, the sliding track is arranged in the cement storehouse, and the storehouse cleaning robot moves along the sliding track to clean hung materials on the wall of the storehouse; the storehouse cleaning robot comprises a scrapping knife device, a conveying device, a crushing device, a distance measuring device and a control box, the scrapping knife device, the conveying device and the crushing device are sequentially connected and communicate with each other, the scrapping knife device is perpendicular to the crushing device, and the control box is arranged outside the cement storehouse; the scrapping knife device comprises combined scrapping knifes and a material collecting mechanism which is arranged below the combined scrapping knifes and communicates with the conveying device; and each combined scrapping knife comprises telescopic drill bits, a rotary knife disc and scrapping knife pieces, telescopic drill bits stretch out and draw back in axial passageways of the rotary knife discs, each scrapping knife piece is provided with a hook structure and a guiding plate, and each hook structure and the corresponding guiding plate form a material storing space with one opening in one side. According to the storehouse cleaning robot system for the cement storehouse, storehouse cleaning cost can be reduced, the storehouse cleaning speed is increased, working environments of workers are improved, and very good market prospects are achieved.