The invention relates to a building antitheft window cleaning robot, which comprises two fixed hanging devices, a spraying device, a rotating sweeping device, a wiping device and an air drying device, wherein the spraying device, the rotating sweeping device, the wiping device and the air drying device are all positioned between the two fixed hanging devices; the rotating sweeping device is positioned between the spraying device and the wiping device; the air drying device is positioned right behind the wiping device; and the left end and the right end of the air drying device are connected with the fixed hanging devices. The building antitheft window cleaning robot has various functions of fixed supporting, spraying water washing, rotating brushing and sweeping, wiping cleaning and air drying blowing, and can be used for cleaning a building antitheft window; the cleaning is convenient; the cleaning speed is high; the cleaning efficiency is high; the cleaning is clean; the effect is good; and the problems of cleaning inconvenience, great risk, low efficiency and the like of manual cleaning in the prior art are solved.