The utility model discloses a safe earth wire, which belongs to the technical field of an earth wire. The earth wire is technically characterized in that the earth wire comprises an earth terminal, an earth lead and a lead clip, wherein the earth terminal comprises a U-shaped frame body and a push rod provided with an earth clamping plate at the top and connected with the frame body through threads, the push rod comprises a casing, a front cavity, a middle cavity and a rear cavity, a sliding bar with a dummy club arranged at the middle part is arranged at the rear end of the earth clamping plate, the sliding bar is inserted into the front cavity, a stop screw connected with the casing through threads is arranged at the front end of the dummy club, a first top spring is arranged behind the dummy club, a baffle sheet connected with the casing through a pin is arranged inside the middle cavity of the sliding bar, the free end of the baffle sheet is provided with a clamping stand and is positioned inside the rear cavity, a plate head clamped with the clamping stand is arranged at the clamping stand side inside the rear cavity, a second top spring is arranged at one side of the clamping stand, away from the plate head, the plate head is connected with a ratchet spanner, and the lead clip is fixed with the handle of the ratchet spanner.