Wireless charging method, device and system

The invention provides a wireless charging method, device and system, and the method is applied to a wireless charging pile, and comprises the steps: obtaining the spatial position and the residence time of an unmanned vehicle in a parking space; if the spatial position meets a first preset condition and the stay time meets a second preset condition, connection information of a wireless network of the charging pile is converted into a waveform signal, and the connection information comprises a first character string representing identification information and a second character string representing a password; sending the waveform signal to the unmanned vehicle; the unmanned vehicle connected with the wireless network is wirelessly charged, and when multiple sets of wireless charging piles and multiple unmanned vehicles work at the same time in the same site, the unmanned vehicle can stay at any parking space, and the unmanned vehicle and the charging piles can realize mutual random identification, so that the