The invention discloses a charge pump circuit working at extra low voltage, comprising a common-source common-body body drive current mirror, a first operational amplifier and a second operational amplifier, wherein the common-source common-body body drive current mirror consists of a first N-type MOS tube, a second N-type MOS tube, a third N-type MOS tube, a fourth N-type MOS tube, a first P-type MOS tube, a second P-type MOS tube, a third P-type MOS tube and a fourth P-type MOS tube, the second N-type MOS tube and the fourth N-type MOS tube not only realize the function of pulling down current tubes, but also realizes the function of pulling down the MOS tubes; the second P-type MOS tube and the fourth P-type MOS tube not only realize the function of pulling up the current tubes, but also realizes the function of pulling up the MOS tubes, thereby realizing the parallel connection relation of an MOS switch function and a current mirror function. The goal of increasing gains is achieved through the two operational amplifiers, i.e. the output resistance of the common-source common-body current mirror can be increased under low supply voltage.