Wireless charging method and related device

The invention provides a wireless charging method and a related device. In the method, a first device to be charged sends first information to a second device capable of providing a wireless charging service to indicate a target working frequency band of the first device, and the second device transmits an electromagnetic wave signal on the target working frequency band based on the first information, the energy of the electromagnetic wave signal received by the first equipment on the target working frequency band is used for charging. Wherein the target working frequency band can be determined according to the working frequency band of the rectifier, for example, the target working frequency band can be the working frequency band of the rectifier or a subset of the working frequency bands of the rectifier. The electromagnetic wave signal is transmitted in the target working frequency band, and high energy conversion efficiency can be obtained, so that in the energy collection process, loss is small, efficient collection of energy by the first device is facilitated, and efficient utilization of energy is achieved.