The invention discloses an establishing method for a post-evaluation index system for a power grid construction project. The establishing method comprises the following steps: determining indexes, establishing a tree-like hierarchy post-evaluation index structure, determining all index weights, determining an evaluation index system, and the like. The establishing method for the post-evaluation index system for the power grid construction project provided by the invention has the following beneficial effects that the post-evaluation index system with directive significance is established by adopting an analytic hierarchy process and a Delphi method, and global and integral evaluation can be performed on the power grid construction project. After the power grid construction project is put into operation for several years, comparatively comprehensive evaluation is performed in all aspects of technical rationality, running safety, power supply quality, operation economy and the like.