Wireless charging device and sacral nerve stimulation system thereof

The invention provides a wireless charging device and a sacral nerve stimulation system thereof. A charging receiving coil is arranged in an implant. When the electric quantity of a built-in battery is insufficient, an extracorporeal charging transmitting coil is arranged at the position matched with the charging receiving coil, and wireless charging for the built-in battery is performed through coupling between the coils. Besides, an intracorporeal charging control unit is also arranged in the implant to detect the electric quantity of the built-in battery and transmit the detected electric quantity information to the outside through the first antenna and the second antenna of the sacral nerve stimulation system so as to prompt a user to charge the built-in battery. Furthermore, when the built-in battery is charged, the charging receiving coil also supplies power to stimulating electrodes so as to ensure that the stimulating electrodes can still perform current stimulation on sacral nerves in charging. The risk of replacing the intracorporeal battery can be reduced for patients and the safety of the sacral nerve stimulation system can be increased.