The utility model relates to a live-line pendulous insulator replacing tool formed by connecting an insulation rod and an operation head, wherein the operation head is movably connected onto a fixed support rack through a rotating shaft which is screw bolt, and the fixed support rack is fixedly connected with the insulation rod. The screw bolt is provided with a butterfly-shaped locking screw nut; the operation head is provided with a picking and hooking head, a stabilizer, a pin pulling device and a push groove. The utility model provides the tool for effectively replacing pendulous insulators in a live-line manner. The tool can be used on pole towers safely and reliably and can be used on bowl heads perpendicular to conducting wires.