Abstract: In order to solve the problem of short working time and poor endurance of unmanned aerial vehicles (UAV), laser wireless power supply was used in UAV. A set of laser wireless energy supply system based on tracking, capturing and aiming was proposed and designed. After theoretical analysis, the experiment of UAV laser wireless power supply was carried out in the outfield of 200m. The results show that, the overall photoelectric conversion efficiency of the system is about 12%, and the tracking accuracy is better than 500μrad. The study provides a reference for the use of laser tracking and wireless energy supply technology for small space spacecrafts.