The invention discloses an electronic archiving method for power grid operation and maintenance project archives. The method comprises the following steps: S1, establishing an electronic archive template library; s2, establishing corresponding relation data of operation inspection project milestone nodes and archives to be synchronously archived, and forming an archive file uploading detail list; s3, establishing milestone plan node data of each operation and maintenance project before implementation of the power grid operation and maintenance project; s4, in the project implementation process, according to the project milestone node data, archiving of archive files is completed synchronously; s5, performing statistics on the archives by adopting a periodic statistics method; and S6, repeating the step S5 until the settlement of the operation inspection project is completed and the archive filing is completed, obtaining project archive abnormality rate data, and carrying out overall evaluation and abnormality analysis on the project archive condition based on the archive abnormality rate data. According to the invention, the standardization, normalization and informatization work level of the project file management of the power grid operation and maintenance project can be improved, and the integrity, accuracy, normalization and timeliness of the project file are ensured.