Switching power supply sampling circuit, switching power supply and household appliance

The utility model discloses a switching power supply sampling circuit, a switching power supply and a household electrical appliance, and the switching power supply sampling circuit comprises a voltage stabilization sampling circuit which is used for connecting the output end of a power supply circuit and triggering and outputting a current sampling signal when the output voltage of the power supply circuit is greater than a preset voltage; the input end of the switch amplification circuit is connected with the output end of the voltage stabilization sampling circuit, and the output end of the switch amplification circuit is used for being connected with the voltage feedback end of the control circuit. And the switch amplification circuit is used for performing current amplification and voltage conversion on the current sampling signal and then outputting a voltage feedback signal corresponding to the current magnitude to the control circuit, so that the control circuit adjusts the output voltage of the power