The utility model discloses a cutting disc for an excrement pumping machine. The cutting disc comprises an inner movable cutter cutting disc, a fixed cutter cutting disc and an outer movable cutter cutting disc, wherein the fixed cutter cutting disc is arranged between the inner movable cutter cutting disc and the outer movable cutter cutting disc and belongs to a hollow disc body provided with fixed cutter cutting blades, inner movable cutter cutting blades are arranged in the inner movable cutter cutting disc, the center part of the inner movable cutter cutting disc is provided with a rotating shaft fixing hole, the outer movable cutter cutting disc consists of a center disc body and outer movable cutter cutting blades, and the center part of the center disc body is provided with a rotating shaft fixing hole. The cutting disc has the advantages that the cutting disc consisting of the inner movable cutter cutting disc, the fixed cutter cutting disc and the outer movable cutter cutting disc is adopted, the technical problems of weak excrement slag crushing and high machine body power loss in the prior art are solved, organic slag materials entering the excrement pumping machine can be cut for 12000 times per minute, the powerful crushing and cutting function is realized, in addition, no friction exists between a rotating shaft and a disc body of the fixed cutter cutting disc, the power loss is reduced, energy sources are saved, the use is convenient, and in addition, the environment is protected.