The invention discloses a grounding wire clamp with adjustable connection bite. The lower end of the upper clamp head is fixedly connected with a positioning plate, and the positioning plate extends downward to the outside of the adjusting fixing plate. The lower chuck is rotatably connected with one end of the adjusting screw, and the other end of the adjusting screw penetrates through and is threadably connected with the upper support plate. The two sides of the bottom of the upper support plate are respectively provided with sliding rails, the adjusting fixing plate is n-shaped, the legs ofthe two adjusting fixing plates are respectively fixed on the two sides of the lower support plate, and the upper arch portions of the two adjusting fixing plates are respectively matched with the sliding rails on the two sides of the upper support plate; The transmission assembly is positioned between the upper support plate and the lower support plate, and is connected with the other end of theadjusting screw, and is connected with the connecting rod. A through hole is arrange in that middle part of the positioning plate along the length direction of the position plate, an arc-shaped through hole is arranged in the upper arch part of the adjusting fixing plate along the circumferential direction of the arch, and the adjust bolt passes through the through hole and the arc-shaped throughhole and is fixed with the nut. By adjusting the upper arch part of the fixing plate and the slide rail of the upper support plate, the invention adjusts the grounding wire clamp to a desired angle.