The invention provides a method for simulating a phase-shifting transformer for a grid. The method includes the following steps: conducting load flow calculation, transient analysis, and short-circuit current determination on an object grid; performing sorting to obtain all line cross section in an application scene; determining a parameter initial value and a site position; optimizing the parameter initial to obtain the maximum phase-shifting angle; mounting the phase-shifting transformer in the object grid, analyzing the changes of the object grid after the mounting of the phase-shifting transformer. According to the invention, the method can provide detailed application plan for the phase-shifting transformer in different application scenes based on the voltage-grading and district-dividing characteristics of the grid. The method also takes into consideration of the influence on phase-shifting functions by each parameter of the phase-shifting transformer and the influence on the object grid by the phase-shifting transformer, which provides key technical references to the application and simulation analysis of the phase-shifting transformer in actual grid, ensures accurate and effective mounting of the phase-shifting transformer in the actual grid, and further increases the operation reliability of the grid.