Building construction outer wall cleaning and maintaining auxiliary device

The invention relates to the technical field of building construction, in particular to a building construction outer wall cleaning and maintaining auxiliary device which comprises a rectangular shell and a holding pipe, a first rotating shaft is rotationally connected to the top face in the rectangular shell, and a first motor is fixedly installed at the top of the rectangular shell; an output shaft of the first motor penetrates through the surface of the rectangular shell, extends into the rectangular shell and then is fixedly connected to the top end of a first rotating shaft, and the bottom end of the first rotating shaft is fixedly connected with a grinding disc. The connecting angle of the holding pipe and the rectangular shell is adjusted through the rotary adjusting mechanism, so that the operation posture is not affected when a worker polishes the lower portion of the outer wall surface, dust falling from the included angle between the wall body and the ground is collected in the process that the rec