The invention discloses a hot-line work overhauling kit and an overhauling method of a cathead tangent tower. The hot-line work overhauling kit comprises an insulating supporting holding rod, a clamping apparatus, a lifting eye and an insulating lifting rope; the clamping apparatus and the lifting eye are respectively arranged at two ends of the insulating supporting holding rod; the clamping apparatus is used for fixing the insulating supporting holding rod and the tangent tower; the lifting eye is used for hanging a hardware fitting and a conducting wire; and the insulating lifting rope is used for lifting and shifting a tower material of the tangent tower. By using the hot-line work overhauling kit and the overhauling method, on the basis of a tower type structure of the cathead tangent tower, by adopting the matched combinative use of a plurality of tools in the hot-line work overhauling kit, various safe insulation distances in a hot-line work overhaul and the lifting of the tower material can be effectively controlled and regulated. Further, the field transportation, the mounting and the dismounting are convenient; the operation is simple; the safe distance in the hot-line work overhaul is easy to control and regulate; and moreover, the normal and safe running of an electric network is not influenced.