The present invention provides a supporting structure of a maintenance platform. The maintenance platform includes a main plate, a supporting module, a plurality of supporting plates, and a plurality of transverse rods. The main plate is provided on the supporting module. The transverse rods penetrate the main plate in a transverse direction. The transverse rods allow the supporting plates to be connected to both sides of the main plate. With the transverse rods penetrating the main plate in a transverse direction, the supporting strength of the maintenance platform is increased, and the undesired break or bend of the supporting plate is reduced.