The invention belongs to the technical field of electric systems, providing a solution method of a local boundary of an injection space voltage stability region (IVSR) having a wind power station for analysis and on-line safe monitoring of power grid voltage stability under the condition that a wind speed is difficult to be correctly forecasted. The method comprises the following steps: firstly, using a trend track and double-layer scheduling model to obtain a modulation unit tightly linked with the wind power station for balancing the fluctuation of the wind power station output power caused by the variation of the wind speed; then, obtaining key nodes of a generator for effectively reducing dimension of the IVSR by using model analysis; and at last, segmenting the regions of possible wind speed and the wind power station output power and calculating, and acquiring the local boundary of the IVSR at the corresponding wind speed through directed perturbation. The invention can rapidly obtain the local boundary of the IVSRat different wind speeds, be used for the on-line voltage stable monitoring of the power system having the wind power station, and has good engineering application prospect.