The invention discloses a building wall 
polishing device, which comprises a 
workbench, a water tank is arranged on the left side of the top of the 
workbench, a water pump is arranged on the right side of the water tank, and a water suction 
pipe is arranged at the input end of the water pump.  The end of the water suction 
pipe away from the water pump is fixedly connected to the water tank, and the inner cavity of the water suction 
pipe communicates with the water tank. The output end of the water pump is provided with a water outlet pipe.  The corresponding side of the movable base is movably connected with a rotating rod, the top and bottom of the rotating rod are provided with 
wind flow plates, and the right side of the top of the 
workbench is provided with a bracket.  The invention cooperates with the water tank, water suction pipe, water pump, water outlet pipe, movable base, air flow plate, rotating rod, connecting pipe and spray head, and can play the role of dust removal on the 
polishing device when the wall is polished by the 
polishing device.  Sanding units work better when sanding walls.