The utility model discloses a cleaning device of a cement mortar stirring pot. The utility model belongs to the technical field of building material production equipment. According to the technical scheme, the device comprises a stirring pot, a support frame is arranged on the stirring pot; the support frame is hinged with the stirring pot; a horizontal support plate is arranged on the support frame; the two ends of the supporting plate are fixedly connected with the supporting frame. A cleaning assembly is arranged on the supporting plate and comprises a connecting base, a connecting rod, a cleaning plate and a driving part, the connecting base is hinged to the supporting plate, the connecting rod is vertically arranged and rotationally connected with the connecting base, the cleaning plate is fixed to the bottom end of the connecting rod and abuts against the inner wall of the stirring pot, and the driving part is connected with the bottom end of the connecting rod and drives the connecting rod to rotate. And the effect of saving time and labor when the stirring pot is cleaned is achieved.