The invention relates to a multifunctional operation combination tool for a current transformer and a circuit breaker. The tool comprises a telescoping insulating rod, a rod end of the telescoping insulating rod is provided with a plug board, an upper board surface of the plug board is provided with a slot, the slot is arranged in a penetrating manner along the length direction of the plug board, the plug board is provided with a plurality of maintenance heads, the maintenance heads are provided with fixing flat boards, and the fixing flat board is inserted in the slot. The maintenance heads used for maintaining the all-fiber current transformer and the isolation circuit breaker are both provided with the fixing flat boards, the fixing flat board is inserted into the slot of the plug board, the installation and the dismounting of the maintenance heads can be conveniently realized, and difference structures of the all-fiber current transformer and the isolation circuit breaker can be maintained.