A thermal protection circuit, wherein the circuit comprises: at least one temperature sensor (011, 021), configured to convert a temperature signal into an electrical signal, and send the electrical signal to a detection circuit (012, 022); the detection circuit (012, 022), configured to: detect, according to the electrical signal received from the temperature sensor (011, 021), whether temperature reaches a preset threshold, and send a turn-off signal to an execution circuit (013, 023) if the temperature reaches the preset threshold; the execution circuit (013, 023), configured to cut off power supply to a system after receiving the turn-off signal from the detection circuit (012, 022); and a self-locking and triggering circuit, configured to maintain, after the power supply to the system is cut off, a power-off state of the system until a power switch is triggered, characterized in that the self-locking and triggering circuit comprises: a first diode, a second diode, a field effect transistor, a first resistor, and the power switch; a first end of the field effect transistor is connected to the temperature sensor, a second end of the field effect transistor is connected to a power supply circuit, a third end and a forth end of the field effect transistor are grounded, and the first resistor is connected to a connection point between the field effect transistor and the power supply circuit; and a cathode of the first diode is oppositely connected to a cathode of the second diode an anode of the first diode is connected to a connection point between the temperature sensor and the field effect transistor, an anode of the second diode is connected to the power supply circuit, and the power switch is connected to a connection point between the cathode of the first diode and the cathode of the second diode. at least one temperature sensor (011, 021), configured to convert a temperature signal into an electrical signal, and send the electrical signal to a detection circuit (012, 022); the detection circuit (012, 022), configured to: detect, according to the electrical signal received from the temperature sensor (011, 021), whether temperature reaches a preset threshold, and send a turn-off signal to an execution circuit (013, 023) if the temperature reaches the preset threshold; the execution circuit (013, 023), configured to cut off power supply to a system after receiving the turn-off signal from the detection circuit (012, 022); and a self-locking and triggering circuit, configured to maintain, after the power supply to the system is cut off, a power-off state of the system until a power switch is triggered, characterized in that the self-locking and triggering circuit comprises: a first diode, a second diode, a field effect transistor, a first resistor, and the power switch; a first end of the field effect transistor is connected to the temperature sensor, a second end of the field effect transistor is connected to a power supply circuit, a third end and a forth end of the field effect transistor are grounded, and the first resistor is connected to a connection point between the field effect transistor and the power supply circuit; and a cathode of the first diode is oppositely connected to a cathode of the second diode an anode of the first diode is connected to a connection point between the temperature sensor and the field effect transistor, an anode of the second diode is connected to the power supply circuit, and the power switch is connected to a connection point between the cathode of the first diode and the cathode of the second diode.