The invention relates to an overhauling tool to disassembling equipment in a transformer substation, in particular to an overhauling disc for a protective cover of a disconnecting switch moving contact. The overhauling disc for the protective cover of the disconnecting switch moving contact comprises a cylindrical base (1), the two opposite ends of the cylindrical base (1) are respectively provided with a fixing pin (2), a circular groove (4) is formed in the position, between the two fixing pins (2), of the cylindrical base (1), and a square inserting hole (3) is formed in the circular groove (4). The overhauling disc for the protective cover of the disconnecting switch moving contact can fully solve the problems that the protective cover of a GW16 type disconnecting switch moving contact is inconvenient to disassemble and the like, structural damage and cracking of the protective cover due to instable locating in the overhauling process can be avoided, the working efficiency of personnel can be improved, working time can be saved, and working intensity can be lowered.