The invention provides a wireless charging method and system, wherein, the method comprises the following steps: an energy receiving end determines the required power of a load; the energy receiving end sends an indication message to an energy transmitting end, wherein the indication message is used for indicating the required power of the determined load; the energy receiving end receives the charging energy emitted by the energy emitting end, wherein, the charging energy emitted by the energy emitting end is the charging energy adjusted by the energy eitting end according to the indication message, and the indication message transmission channel and the charging energy transmission channel are mutually independent. By adopting the technical scheme, the problem that the energy emitting end of the wireless charger cannot effectively adjust the energy output according to the power change of the load in related technologies is solved.