The invention discloses a transmission line grounding clamp being convenient to locate, mount or dismount. The grounding clamp comprises a clamp plate I and a clamp plate II; connecting pieces are arranged at the middle parts of the clamp plate I and the clamp plate II; and the clamp plate I and the clamp plate II are connived movably by the connecting pieces. A torsional spring is arranged at connecting part between the clamp plate I and the clamp plate II; and the tail ends of support bars at the two sides of the torsional spring are arranged at the clamp plate I and the clamp plate II respectively to support and open the upper parts of the clamp plate I and the clamp plate II. A through hole is formed in the clamp plate I; a sliding sleeve sleeves the periphery of the clamp plate I at the through hole; the tail end of the supprot bar at one side of the torsional spring is arranged at the sliding sleeve; and a pull wire is connected to the top of the sliding sleeve. The clamp plate Iis connected with one support rod movably; a clamp slot is formed in the tail end of the support rod; and a clamp block matching the clamp slot is arranged at the clamp plate II. The support rod is arranged below the connecting pieces. The ground clamp can be installed or removed conveniently; and the safety is high.