Embodiments of the invention disclose a switching circuit of an unmanned aerial vehicle. The switching circuit comprises a switching element, a working state control unit, a working state keeping unit and a control module. After the switching element is closed, the working state control unit is turned on, and the control module controls the working state keeping unit to be turned on. After the switching element is opened, the working state keeping unit controls the working state control unit to keep an on state, and an output terminal of the working state control unit provides a load with working current. When the closing time of the switching element exceeds a preset value, the control module controls the working state keeping unit to be turned off, the working state keeping unit controls the working state control unit to be turned off, and the output terminal of the working state control unit stops providing the load with working current. According to the technical scheme of the embodiments, a power supply circuit of the unmanned aerial vehicle can be controlled by a small-sized switch, and air safety is ensured.