The invention provides a method and tool for replacing a continuous cladding mold for aluminum sheaths of cables, and belongs to the field of equipment manufacturing and cable manufacturing. A first oil cylinder used for dismounting a locking nut is mounted on the side face of a fixing base and is connected with a spanner through hinge pins located at the tail end of the spanner. The front end ofthe spanner is connected with the locking nut at the top end of a mold cavity through a hexagonal block. The first oil cylinder reciprocates to loosen or lock the locking nut. A second oil cylinder used for ejecting the mold is mounted on the bottom surface of the fixing base. A push-pull rod is connected with a piston of the second oil cylinder. When one end of the push-pull rod is connected witha hole sealing plate, the push-pull rod is used for removing a female mold body. When one end of the push-pull rod is connected with an aluminum cutter, the push-pull rod is used for cutting off residual aluminum. When one end of the push-pull rod is connected with a push plate, the push-pull rod is used for pushing out a male mold body. According to the method and device for replacing the continuous cladding mold for the aluminum sheaths of the cables, all components are ingenious in structure and design, a distribution mold does not need to be removed, soaking in a sodium hydroxide solutionis not needed, replacement of the male cladding mold body and the female cladding mold body can be completed in a short time (one hour), the mold replacement time is greatly shortened, the labor intensity is relieved, and meanwhile, the problem of pollution caused by waste sodium hydroxide liquor is solved.