Power supply circuit with soft start function

The invention relates to a power supply circuit with a soft start function, which is characterized by comprising a soft start circuit (1), a control circuit (2) and a main power supply loop (3), the main power supply loop (3) comprises a switching device, one end of the control end of the switching device is connected with a power supply through the soft start circuit (1), the other end of the control end of the switching device is grounded through a switching tube in the control circuit (2), and the control end of the switching tube is connected with a divider resistor used for conducting the switching tube in parallel; an on-off port of the switching device is connected in series between the power supply and the output end of the power supply circuit; the soft start circuit (1) comprises a current limiting loop. The problems that in the prior art, when the power-on impact current is restrained, large channel loss is introduced, or when the conduction loss is small, the power-on impact current is large, and