This application discloses a wireless charging method, a device, and a wireless charging system. The wireless charging system may include a transmitter and a receiver; the transmitter includes a transmitter coil and a first series matching capacitor, the transmitter coil is connected to the first series matching capacitor in series to form a first oscillation circuit, and the first oscillation circuit is configured to transfer power to the receiver; and the receiver includes a receiver coil and a second series matching capacitor, the receiver coil is connected to the second series matching capacitor in series to form a second oscillation circuit, and the second oscillation circuit is configured to receive the power transferred by the first oscillation circuit. Implementation of embodiments of this application can reduce an electrical energy loss in the receiver, and improve charging efficiency of the receiver.