Water inlet protection circuit, power supply circuit, device and unmanned equipment

The embodiment of the utility model discloses a water inlet protection circuit, a power supply circuit, a device and unmanned equipment. According to the technical scheme provided by the embodiment of the invention, short circuit detection is performed through the short circuit detection terminal, the short circuit detection result is sent to the switch control circuit, and when the short circuit detection result indicates that short circuit occurs, the switch control circuit sends the turn-off control signal to the power supply switch circuit; meanwhile, the switch control circuit is maintained in a self-locking state through the self-locking circuit, and the switch control circuit can be switched off even if the equipment is aired, so that the power supply can be stopped from supplying power to other electric devices. And the switch control circuit still continuously sends a turn-off control signal to the control end of the power supply switch circuit without supplying power to the internal circuit of the e