The invention relates to a special wall cleaning robot for cement fiberboard, a building decoration material, which includes a lifting platform, a bottom plate, a filling device, a leveling device and a brushing device. A leveling device is installed, and a brushing device is installed at the rear end of the bottom plate. The number of filling devices is three, and the three filling devices are evenly installed at the front end of the bottom plate. Each filling device includes a placing frame, a fixing plate, a pushing cylinder, a sliding plate, and a dividing frame , fixed frame, adjusting cylinder, electric slide table, lifting cylinder, lifting frame, traction electric push rod, sliding frame and spray gun. The invention can solve the problems of high labor intensity, high labor cost, potential safety hazards, complicated operation, uneven filling and low work efficiency existing in the existing cement fiberboard wall surface cleaning technology, and can realize cleaning of the cement limit board wall surface. Automatic cleaning function.