The present invention provides a circuit configured to slowly start a power supply loop to discharge electricity. The circuit comprises: a charging circuit, a discharging circuit and a switching circuit configured to slowly start. The charging circuit is connected to the discharging circuit and the switching circuit, and the discharging circuit is connected to the switching circuit. The charging circuit is configured to slowly start a power supply loop to supply power. During power failure or hot swapping, the discharging circuit is configured to discharge electricity from the switching circuit. The present invention solves the problem of slow discharging of a main loop MOS tube in a slow start circuit in the related art.
