Abstract: It is an attempt of traditional technology and new technology to apply UAV to transmission line maintenance and innovate live working method of power line. The UAV is equipped with a rope thrower to connect the automatic hook and high-strength insulating rope. The automatic hook is hung on the high-voltage wire by the UAV. The maintenance personnel can use the electric lifting device to lift along the high-strength insulating rope and rise to the working position for maintenance, which improves the operation efficiency. Practice has proved that this method is worthy of popularization and application.