The invention discloses a mortar mixer convenient to clean. The mortar mixer convenient to clean comprises a shell assembly and a rotating assembly, wherein the shell assembly comprises a small material adding hopper, a mixing box, a discharging hopper, a feeding hopper, a rack and a loading machine; the small material adding hopper is positioned on the upper surface of the mixing box and is fixedly connected with the mixing box; the discharging hopper is positioned on the lower surface of the mixing box and is fixedly connected with the mixing box; the feeding hopper is positioned below the loading machine and is fixedly connected with the loading machine; the rotating assembly comprises a motor, a speed reducer, a raising motor, blades, a rotating shaft, a connecting rod and a scraper blade; the motor is positioned above the rack and is fixedly connected with the rack; after stirring of an original machine is finished, the inner wall of the mixing box has residues which cannot be cleaned easily, resources are wasted, if the scraper blade is arranged in the mixing box, the residues on the inner wall can be scraped off and continue to be mixed, the utilization rate of the resourcesis increased, and thus, the mortar mixer brings convenience to users.