Abstract: Microwave wireless power transmission technology has attracted extensive attention in recent years because of its long transmission distance and easy regulation. In this paper, a beam scanning planar reflectarray based on mobile feed is proposed. The array is composed of 19×19 phase-shifting units, and the overall size is 490.2 mm×490.2 mm. The simulation results show that the proposed phase-shifting unit can cover 360° all phase,and the reflection coefficient is greater than -0.1 dB (97.7%). Based on CST full wave simulation, it is found that the scanning angle of the designed reflectarray is -28°- +25°. At the same time, a micro power transmission system is built to verify the performance of the reflectarray antenna.Through experimental verification, it is found that the power obtained by the receiving terminal of the wireless power transmission system with a planar reflectarray antenna is about 700% -1500% of that without a reflectarray in the near-field range of its radiation, which is very conducive to the power transmission of the power transmission system. The simulation and experimental results show that the reflectarray antenna has a certain application prospect in the field of microwave wireless power transmission.