Band-gap reference circuit capable of eliminating offset voltage influence

The utility model belongs to the field of analog integrated circuit design, and particularly discloses a band-gap reference circuit capable of eliminating offset voltage influence, which comprises a folding cascode operational amplifier with PMOS and NMOS input differential pairs, a selector, a bias circuit and a bipolar band-gap output circuit, wherein the selector is controlled by a two-phase non-overlapping clock, so that the cascode operational amplifier can be switched back and forth between an offset storage working mode and a differential amplification working mode. In the imbalance storage mode, the connection between the cascode operational amplifier and the band gap output circuit is disconnected, and the imbalance voltage is stored on the NMOS differential pair through feedback;in the differential amplification mode, the connection between the cascode operational amplifier and the band gap output circuit is recovered, and the offset on the PMOS differential pair and the offset stored on the NMOS di