The inVention discloses a high-precision low-offset band-gap reference Voltage circuit, and belongs to the technical field of electronic circuits. The circuit comprises a pre-regulator module, a precise band-gap reference module and a trimming code Value generation module; when the circuit starts working, the pre-regulator module generates an initial internal supply Voltage to supply electricity to the precise band-gap reference module and the trimming code Value generation module, the trimming code Value generation module generates a trimming code Value to be supplied to the precise band-gapreference module which calibrates generated precise band-gap reference Voltage, the generated precise band-gap reference Voltage is fed back to the pre-regulator module to calibrate the internal supply Voltage to generate precise internal supply Voltage to continue to supply electricity to the precise band-gap reference module and the trimming code Value generation module. Accordingly, by means ofa trimming technology, the band-gap reference Voltage is calibrated; meanwhile, by means of a feedback technology, the precise internal supply Voltage is generated, and the precision requirement anddesign difficulty of subsequent modules are lowered; after the trimming code Value is generated, the trimming code Value generation module is closed, and power consumption of the circuit is lowered.