The utility model relates to a telescopic grounding wire and belongs to the power transmission and distribution engineering technology field. The telescopic grounding wire comprises a grounding wire, wherein the grounding wire is twined on a twining rod, use length of the grounding wire is telescopic, one end of the grounding wire is connected in parallel with three branch wires and is in three-phase connection with detected equipment, and the other end of the grounding wire has a stud connector and is connected with a grounding wire pile. The telescopic grounding wire has properties of strong versatility and precise wiring, can be used instantly and is used for overhaul of power transmission and distribution equipment.