The invention relates to the field of robots, in particular to a wall spraying robot. The wall spraying robot comprises a movable platform; the movable platform is provided with a moving mechanism; the movable platform is also provided with a Z-direction moving mechanism used for adjusting the up and down position; the Z-direction moving mechanism is provided with a Y-direction moving mechanism used for adjusting the horizontal position; the Y-direction moving mechanism is provided with an X-direction moving mechanism used for adjusting the front and back position; the movable platform is provided with a spraying system. Compared with a joint type spraying robot, the wall spraying robot provided by the invention is low in manufacturing cost as well as convenient to use and maintain; by adopting adjustment along the X direction, the Y direction and the Z direction, the wall spraying robot enables spraying to have comprehensiveness and uniformity, thus avoiding the phenomenon of inadequate spraying; after the robot is used for replacing manual painting, the efficiency and quality of automatic spraying are improved while the labor intensity of workers is lightened.