The invention relates to a wall-climbing robot applied in tall buildings facade cleaning which is characterized in that the invention comprises wire driven systems, a facade mobile platform and a thrust device; the invention has two sets of the flexible cable driving systems comprising wires and a hoisting system which is arranged on the two side of the top of the building facade and comprises anelectric motor speed reducer component, a wound roll and a crown block; the electric motor speed reducer component and the wound roll are arranged on the facade of the building; the wound roll and anelectric motor are connected with the output shaft of the speed reducer component; one end of the wires are respectively arranged on the facade mobile platform and the other end rounds the crown block and fixes on the wound roll; the side close to the building facade of the facade mobile platform has a passive mobile device to ensure the facade mobile platform to move; the thrust device is arranged on the facies lateralis of the facade mobile platform. The invention has the advantages of big space, simple control, reliable operation, good expansibility, strong adaptability for facade, etc.