The invention discloses an anti-drop grounding line for a transmission line. The anti-drop grounding line comprises a hook, a grounding line, a connecting rope, a clamping plate, a clip plate, a wire grip and a locking screw, wherein a threaded hole corresponding to the locking screw is formed in the top plate of the clamping plate; the locking screw is mounted in the threaded hole in the top plate of the clamping plate, a rotating handle is arranged at the top of the locking screw, a mounting rod is arranged at the bottom of the locking screw, the outside diameter of the mounting rod is smaller than the outside diameter of the body of the locking screw, threads are arranged on the lower segment of the mounting rod, and the clip plate is connected with the mounting rod via a nut; the wire grip is mounted on the clamping plate; one end of the grounding line is connected with the hook, and the other end of the grounding line is connected with the clamping plate; and one end of the connecting rope is used for bundling and fixing the hook with the transmission line, and the other end of the connecting rope is connected with the wire grip. The locking screw can be rotated to adjust the distance between the clip plate and the lower end face of the clamping plate, so as to be clamped on a transmission tower. The connecting rope is configured to fix the grounding line with the transmission line, the grounding line is loose, and the connecting rope is tightened to prevent the hook and the transmission line from disengagement to cause a situation of poor grounding of the transmission line.