The invention discloses a wall climbing and cleaning robot which comprises a base plate, three fan suction cups, a cleaning plate and rotating wheels, the three fan suction cups are arranged at the positions of two vertex angles of the front end of the base plate and the center position of the rear end of the base plate, the cleaning plate is fixedly mounted to the lower end of the base plate, the lower end of the cleaning plate is provided with a cleaning rotating machine which is transversely mounted, the rotating wheels are symmetrically and fixedly mounted at the rear end of the base plate through a rotating shaft, the side ends of the rotating wheels are each provided with a rotating wheel motor, the base plate is further provided with an infrared sensing device, and the upper end of the base plate is provided with a chip processor. The three large-power fan suction cups are arranged, the wall climbing function is achieved, the specific positions of the three fan suction cups are set, the principle that the triangle is mostly stable is utilized, and movement of the wall climbing and cleaning robot can be more stable.