The invention provides an N-well potential control circuit used in a booster circuit, which comprises a comparator circuit, an input power supply selectron, an output voltage selectron, a first control circuit and a second control circuit, wherein the comparator circuit is composed of an MOS tube and a current source and is used for comparing an input power supply Vin in which the booster circuitis accessed with an output voltage Vout; the input power supply selectron and the output voltage selectron are respectively accessed in the input power supply Vin and the voltage Vout and are in output interconnection so as to be connected with the N well in the booster circuit; the first control circuit is connected on the output end of the comparator circuit so as to be capable of providing a cutoff signal with the voltage no less than Vout for the output voltage selectron when the input power supply selectron is conducted; and the second control circuit is connected with the output end of the comparator circuit and the output end of the booster circuit respectively so as to be capable of providing a cutoff signal with the voltage no less than Vin for the input power supply selectron when the output voltage selectron is conducted, thus the input power supply selectron can be completely cut off when the voltage of the input power supply is lower than the output voltage of the boostercircuit, thereby lowering power consumption effectively, enhancing the circuit stability and reducing the chip area.