The invention provides a mobile vehicle wireless charging system. The system comprises a vehicle position detecting device composed of a vehicle-mounted wireless signal transmission module and a ground wireless signal receiving module, a resonance energy transmission circuit laid underground and a resonance vehicle-mounted energy receiving device; when an electric vehicle detects that a battery is in the electricity lack state, and wants to enter in the charging segment, a vehicle-mounted information transmission device is started and emits signals; when the ground signal receiving device receives the emitted signals, an energy transmission coil laid under the charging segment is started, and the pre-charging preparation state is executed. On the one hand, the problem that in the process of moving of the electric vehicle in the charging segment, charging preparation is slow is solved; on the other hand, the problem that the energy transmission coil is in the work state all the time, and energy losses are caused is solved.