As a new type of power transmission technology, wireless energy transmission provides a convenient charging way for the rapid growth of electronic products. The large power driving circuit, charging distance and efficiency have been factors restricting the application of wireless charging technology. In order to solve these problems, the equivalent circuit of wireless charging is analyzed theoretically based on the theory of magnetic coupling wireless energy transmission, and the main factors that affect the charging efficiency are discussed. Using STM32 microcontroller as control core, a wireless power transmission charging experimental platform is built through the design of high power H bridge driving circuit and rectifier circuit. Based on this platform, factors affecting the system performance analyzed, including the operating frequency of the system, the distance of wireless charging and the relay coil. The results show that the system function of the wireless energy transmission charging platform is relatively complete. With the certain 24 V driving voltage and the certain charging distance of 2 cm, the load receiving power can reach 2.5 W.