The invention discloses a flyback switch voltage-stabilization power supply. The flyback switch voltage-stabilization power supply comprises an input rectification filtering circuit, a control circuit, a high-frequency transformer, an output rectification filtering circuit and a feedback circuit which are sequentially connected, wherein the feedback circuit comprises a voltage feedback circuit anda current feedback circuit, an input end of the control circuit is connected with the input rectification filtering circuit, an output end of the control circuit is connected with the output rectification filtering circuit by the high-frequency transformer, the output rectification filtering circuit outputs a DC voltage, the high-frequency transformer is further connected with the control circuitby the current feedback circuit, and the output rectification filtering circuit is connected with the control circuit by the voltage feedback circuit. The size of the output voltage can be adjusted by the control circuit, so that the output voltage can change with a load, the load stably works, a switch tube is switched off when overcurrent occurs in the switch power supply, and the protection ofthe switch tube is achieved.