Disclosed is an AVC (automatic voltage control) substation technical performance calibrating method. The AVC substation technical performance calibrating method includes that an integrated simulation global power grid digital model conducts power flow calculation through a power grid operation section, an AVC master station simulation module inputs according to a power flow calculation result and sends a voltage regulation command to a to-be-calibrated AVC substation of a power plant and an AVC control policy to the integrated simulation global power grid digital model, the to-be-calibrated AVC substation of the power plant calculates a generator set regulation policy according to the voltage regulation command and sends the generator set regulation policy to the integrated simulation global power grid digital model, and the integrated simulation global power grid digital model controls reactive-power output of a corresponding generator or other reactive power devices in the integrated simulation global power grid digital model according to the AVC control policy sent by the AVC master station simulation module or the generator set regulation policy sent by the to-be-calibrated AVC substation of the power plant so as to achieve closed-loop control. The AVC substation technical performance calibrating method is capable of estimating reactive-power regulation or voltage regulation of the AVC substation in advance, so that accuracy and timeliness of reactive-power regulation or voltage regulation of the AVC substation are ensured, the voltage stabilizing level of a power grid is enhanced, and safety operation and the electric energy quality of the power grid are guaranteed.