The invention provides a curtain wall cleaning robot, relates to the technical field of cleaning machineries, and aims to alleviate the technical problem that in the prior art, friction force betweenwalking wheels and a curtain wall is excessively large and therefore the curtain wall is possibly damaged. The curtain wall cleaning robot comprises a rack, a rolling brush assembly, the walking wheels and a pressure adjusting assembly, wherein the rolling brush assembly comprises a barrel body and a sweeping piece arranged on the outer peripheral wall of the barrel body; the barrel body and the walking wheels are pivoted to the rack; a rotation center line of the barrel body is parallel to that of the walking wheels; the outer edge of the sweeping piece protrudes out of the outer edges of thewalking wheels, so that the sweeping piece and the walking wheels can abut against the curtain wall to be cleaned; the pressure adjusting assembly is installed on the rack; and the pressure adjustingassembly can adjust the pressures between the walking wheels and the curtain wall to be cleaned.