Building outer wall cleaning device

The utility model discloses a building exterior wall cleaning device which comprises a wall body and a floor located at the top end of the wall body, a first housing and a second housing which are transversely arranged are symmetrically arranged on one side of the wall body, and a movable block connected with the second housing is arranged at the top end of the first housing. The two ends of the movable block are correspondingly connected with the lead screw and the guide rod located in the first housing and the second housing correspondingly, and a cleaning plate is arranged on the side, close to the wall, of the movable block. The device has the beneficial effects that a bracket is driven by centrifugal force generated by rotation of a semicircular wheel to shake, so that the bracket drives a cleaning plate and bristles to shake through a connecting block, and dust and impurities are prevented from being extruded on one side and attached to the side edge of the outer wall of a wall when the cleaning plate a