This invention is a robot walking automatically along 110kV transmitting wire and its operational method. It is composed of the robot reality, the control device, the sensor, the detecting device and wireless image transmitting device; the control device and the wireless image transmitting device are set in the control box in the middle of the robot reality, the position sensors are equipped at the terminals of every joint, the visual sensor CCD measuring the distance of sensors and obstacle is equipped in the front of every hand, the detecting device includes high speed vidicon and the hot imaging device connected to the robot reality through the platform. It can walk stably on the 110kV transmitting wire and automatically span all kinds of obstacles on the wire, and it replaces the human to patrol the transmitting wire and reduces the working amount of patrolling, and improves the working efficiency and detecting precision to assure the safe operation of the electric wire.