Abstract: A vacuum suction wall-climbing robot including a body, a vacuum pump and at least four leg mechanisms is disclosed. Each leg mechanism includes a foot unit and a limb unit connecting the foot unit and the body. The foot unit includes a plurality of suction sets connected to the vacuum pump through a pipe. Each suction set includes a sucker able to create a vacuum state within a contact area through the operation of the vacuum pump, and a sheet valve arranged between the pipe and the sucker, which automatically closes the connection between the pipe and the sucker when the vacuum state between the sucker and the contact area becomes a non-vacuum state.