The invention discloses a hemispherical maintenance platform for electric power maintenance and relates to the technical field of a maintenance device for a power supply system, including hemispherical hollow seats, a liftable workbench arranged inside that hollow seat, an electric inspection mechanism arranged on the workbench which is provided with an electric shock-proof expandable insulating film, wherein the insulating film is located on both sides of the electric inspection mechanism, and an expandable insulating ring is arranged at the annular opening of the hollow seat, so as to solvethe technical problems of difficult electric inspection and poor safety of large conductors existing in the prior art.