Building wall surface dust removal device

The utility model discloses a dust removal device for a building wall surface. Hollow stand column, a gear belt is arranged in the hollow stand column. A driven gear is arranged at the upper end of the hollow stand column; a curtain wall is arranged on one side of the hollow stand column. A sliding plate is arranged on the front surface of the gear belt; a driven gear is arranged at the lower endof the gear belt, a touch sensor is arranged on one side of the driven gear, a brush is arranged on the rear surface of the sliding plate, a water outlet pipe is arranged at the upper end of the sliding plate, a spray head is arranged on the rear surface of the water outlet pipe, a motor is arranged on one side of the driven gear, and an inverter is arranged on one side of the motor. The air blower is arranged, air blowing and blow-drying can be conveniently conducted after the wall surface is cleaned, it is avoided that water drops left after cleaning easily adsorb dust, and therefore the cleaning effect is improved,