Wireless charging technology is more and more widely used in UAV, home appliances, electric vehicles and other fields because of its flexibility, reliability and safety. In order to achieve the optimal energy efficiency and condition monitoring of the system and improve the performance of the wireless charging system, the identity authentication and communication connection between the UAV and the charging end need to be carried out before wireless charging to ensure the normal operation of the charging process. Because the traditional communication mode has the problem of chaotic connection in the communication connection of multi UAV wireless charging system, resulting in the disorder of the charging system, it is necessary to authenticate the ID information between the charging end and the UAV before charging the UAV, complete the communication connection between the UAV and the charging end, ensure that the charging end and the UAV are charged after establishing the communication connection, and ensure the normal charging process. In order to solve the problem of chaotic communication of multi UAV wireless charging system, this paper proposes a method of multi UAV wireless charging identity authentication based on the method of inverse modulation. Based on the original UAV wireless charging system, before wireless charging, the driving signal of the inverter circuit is used as the carrier to modulate the unique ID information of the charging end and generate the electric energy signal carrying the ID information of the charging end, After receiving the electric energy signal, the UAV identifies the ID of the charging end for communication pairing, and then the inverter circuit works at a fixed frequency of energy transmission to wirelessly charge the UAV. This method carries out identification through the UAV wireless charging system itself, without adding additional hardware circuit and signal transmission coil, and simplifies the system structure and cost.