Low-power wireless charging device

The utility model discloses a low-power wireless charging device, which comprises a PCB (printed circuit board) and a USB (universal serial bus) plug U1, a wireless transmitting coil L1 is arranged on the top surface of the PCB, a wireless charging circuit is arranged on the bottom surface of the PCB, a resistor R1 is connected between a power supply anode of the USB plug U1 and a VDD pin of a wireless transmitting chip U2, a VSS pin of the wireless transmitting chip U2 is grounded, and the USB plug U1 is connected with the wireless charging circuit. The resistor R7 is connected between a PWM pin of the wireless transmitting chip U2 and a grid electrode of the MOS tube Q1, a source electrode of the MOS tube Q1 is grounded, an anode of the diode D1 is connected to the source electrode of the MOS tube Q1, a cathode of the diode D1 is connected to a drain electrode of the MOS tube Q1, a first end of the wireless transmitting coil L1 is connected to a power supply anode of the USB plug U1, a second end of the wir