The invention relates to a standardized maintenance method for a reconstruction and extension information point table of a running substation. The method is characterized by comprising the following steps of compiling an information access application form according to running substation transformation range and generating regularized reconstruction and extension equipment monitoring information points according to the existing intervals and an equipment type structure; generating reconstruction and extension intervals and equipment monitoring information point numbers; and exporting the generated information point table and carrying out flow joint debugging check on the information point table. According to the method, by utilizing a way of constructing the substation intervals and equipment thereof through the structured organization, and a complete rule base, the reconstruction and extension information point table is quickly generated, and meanwhile, filing retention of the point table of each edition in each stage is formed to guarantee the system to view the data of the information point table in each stage at any time; a convenient and efficient support is provided for the maintenance work of the reconstruction and extension information point table of the substation, normalization and standardization of monitoring of the information point table are guaranteed, the check period is shortened, the work quality and the work efficiency are improved, and the equipment running safety is guaranteed.