The invention relates to a window wiping robot which comprises a wiping mechanism body and two obstacle crossing mechanisms.The two obstacle crossing mechanisms are arranged on the two sides of the wiping mechanism body respectively and arranged front and back in the obstacle crossing direction of the wiping mechanism body.Each obstacle crossing mechanism comprises a telescopic crankshaft, walking wheels and a driving assembly, wherein one end of the telescopic crankshaft is rotationally connected with the wiping mechanism body, the walking wheels are rotationally connected to the other end of the telescopic crankshaft and telescopically move under driving of the telescopic crankshaft, and the driving assembly is connected with the walking wheels and used for driving the walking wheels to rotate.Each walking wheel comprises a wheel disc, wherein a plurality of spokes which are equal in length and are distributed evenly are arranged on the periphery of the wheel disc, and a walking sucker is hinged to the end of each spoke.The telescopic crankshafts are controlled to contract so that the walking suckers can fall onto the surface of glass for suction fixation, the wiping mechanism body is lifted and leaves the surface of the glass and is higher than a window frame, the walking suckers suck and leave the surface of the glass in a nonsymmetrical mode in the obstacle cross direction of the wiping mechanism body in sequence, and the walking action of the wiping mechanism body in the obstacle cross process is completed.