The utility model discloses a cable ground wire, include the ground clamp main part, revolve union piece, first insulation pole and second insulator spindle. Be provided with the locating hole that isused for the cover to locate to cable junction in the ground clamp main part, the top of ground clamp main part is provided with the screw hole, and the extending direction of screw hole is perpendicular with the extending direction of locating hole, revolve union piece and threaded hole bolt joint, the bottom of revolving the union piece is passed the screw hole and is lain in the locating hole,and the top of revolving the union piece lies in outside the locating hole, the link of first insulation pole is provided with and is used for twising reverse the connection structure on union piecetop soon, the link of second insulator spindle is articulated with the bottom of ground clamp main part. This cable ground wire can directly send the ground clamp main part into the cubical switchboard when using in, and the second insulator spindle mainly is located outside the cubical switchboard to satisfying the operation demand in narrow and small space, finding good angle to be connected tocable junction department with cable ground wire easily, the operation degree of difficulty is little. And this cable ground wire's ground connection reliability is high, is difficult for droing.