The invention discloses a graph multi-version dynamic storing and publishing method for an electric power system. The method comprises the following steps: (1) importing a graph and a model by using a graph model maintenance tool, and downloading a graph information table to form a current graph file set and graph maintenance information; (2) manually creating a model version number, and establishing a graph version storage identifier by the graph according to the current model version number; (3) editing the graph for maintaining, storing the graph in a network after the editing is completed, updating the graph information table by the graph, and storing a graph file to the current graph version storage identifier of a file server; (4) before the graph is published, comparing the versions of the graph and the model to ensure the integrity of the graph version; (5) performing graph verifying according to a graph verifying rule; (6) after the graph and the model are verified, putting the graph and the model on line formally. According to the method disclosed by the invention, the graph model maintenance task integration is ensured; the graph model maintenance supporting capacity, the practical level of a plurality of versions of the graph and the model and the graph version accessing efficiency are improved; therefore, the graph multi-version dynamic storing and publishing method for the electric power system has a good application prospect.