Voltage equalizing circuit and switching power supply

The utility model provides a voltage-sharing circuit and a switching power supply. The voltage-sharing circuit is characterized in that an input end of a first winding is connected with a high-voltage positive power supply input end of an upper electrolytic capacitor module, and an output end of the first winding is connected in series with a first voltage-sharing module and then is connected with a high-voltage negative power supply input end of the upper electrolytic capacitor module; the input end of the second winding is connected with the low-voltage positive power input end of the lower electrolytic capacitor module, and the output end of the second winding is connected with the low-voltage negative power input end of the lower electrolytic capacitor module after being connected in series with the second voltage-sharing module; the input end of the third winding is connected with the low-voltage positive power supply output end of the lower electrolytic capacitor module; the input end of the fourth wind