The invention discloses a manual wall painting machine which comprises a three-way pipe, a fixed handle and a regulating handle, wherein the three-way pipe is respectively connected with a roller, a non-return valve and one end of a liquid absorption cylinder; a movable pull rod is arranged in the liquid absorption cylinder; the front end of the movable pull rod is provided with a gland cover of which the inner diameter corresponds to that of the liquid absorption cylinder; the other end of the liquid absorption cylinder is connected with one end of the fixed handle; a cavity is arranged in the fixed handle; a boosting block, an elastic device and a baffle are arranged in the cavity; the regulating handle is sheathed on the boosting block; the other end of the fixed handle is rotatably connected with the outer wall of the regulating handle; the inner wall of the regulating handle is provided with a convex slide block; the boosting block is provided with an oblique cambered surface matching the slide block; the movable pull rod extends outwards after penetrating through the fixed handle, the boosting block and the regulating handle; the movable pull rod is provided with a rack; andthe inner wall of the boosting block is provided with a convex buckle matching the rack. The invention has the advantages of uniform feeding, high feeding speed and labor saving, and the movable pullrod can automatically lock and can not retract after finishing feeding.