Protection device for grounding wire

The invention belongs to the technical field of grounding protection and particularly relates to a protection device for a grounding wire. The device comprises an insulating bottom box, an insulatingsealing box cover and positioning pieces, a positioning convex ring or a positioning convex column is arranged in the insulating bottom box, the positioning pieces comprises L-shaped plate-shaped positioning plates, and a positioning hoop is matched with a sliding rail on a horizontal plate section; the positioning pieces further comprise compression springs; a positioning ring is arranged at thehead end of the horizontal plate section and coaxially arranged on the positioning convex ring or the positioning convex column in a sleeving manner; the positioning rings of the positioning pieces have a height difference on the positioning convex ring or the positioning convex column so as to avoid each other in the mounting space; the box wall of the insulating bottom box is concavely providedwith an avoidance groove us