Abstract: To the problems of poor mobility, light shielding and light dazzling from ground searchlight in power transmission workplace at night, a long endurance UAV lighting device is proposed to provide lighting for power transmission maintenance from the sky. The device uses high-altitude virtual battery technology, AC/DC converter principle, highlighted COB lighting technology, etc., to solve the emergency lighting problem in the transmission high-altitude operation environment without the UAV's own battery. It reduces the risk of rush repair operation at night, so as to achieve the goal of the long-term high-altitude lighting .