The invention discloses an auxiliary tool for installing a grounding line, and the tool comprises a main body (1), protection edges (2), lifting rings (3), a baffle plate (4), an H-shaped groove (5) and a U-shaped groove (6). The main body (1) is shaped like A, and the baffle plate (4) is welded at the edge of the other side of the top of the main body (1). The protection edges (2) are disposed at two sides of the main body (1). The protection edges (2) can achieve a protection effect, and can prevent other tools from damaging the main body (1). The lifting rings (3) are welded at the tops of the protection edges (2). The U-shaped groove (6) and the H-shaped groove (5) are welded at the top of the main body (1), wherein the H-shaped groove (5) is disposed at the center of the top, and the U-shaped groove (6) is disposed at the edge of the top. A wire clamp is disposed on the H-shaped groove in an upwards clamping manner, and the edge of the wire clamp is placed on the U-shaped groove, thereby achieving a purpose that the wire clamp is parallel to the ground, and enabling a single person to be able to complete the butt joint of the wire clamp and a grounding gun. The tool is good in universality, is suitable for various types of spring hook type wire clamp grounding lines, is small in size, is light in weight, is convenient to move and lay, is neat in shape, facilitates the arrangement, and is simple and beautiful.