The invention provides a regional power grid active standby assessment method. The method comprises the steps of: obtaining regional network operation data; performing power grid system active standbymaintaining calculation according to the regional power grid operation data based on a pre-constructed regional power grid active standby index system to obtain standby maintaining estimation data; and according to the standby maintaining estimation data, performing assessment of the standby capacity and a standby adequacy configured by a regional power grid. The technical scheme provided by theinvention considers the demands of different regulation and control scenes of the power grid in the time-space dimension to construct the regional power grid active standby index system, and is used for guidance of calculation and assessment of power grid standby maintaining to facilitate guaranteeing of the reliability of the operation of the power grid system.