The invention discloses a novel special grounding line for bus-bars, and relates to the technical field of grounding devices. The grounding line comprises a U-shaped clamp body which is arranged transversely. An upper side plate of the clamp body is thinner than a lower side plate of the clamp body. A groove used for accommodating a locking mechanism is arranged in the lower side plate. A moving pressure plate capable of sliding along the length direction of a bottom plate of the clamp body is arranged on the bottom plate. The lower side of the moving pressure plate is rotationally connected with a worm. The worm passes through the lower side plate of the clamp body and is in meshed connection with the lower side plate through helical teeth, and the worm passes through the cavity of the groove. Under pushing of the worm, the moving pressure plate works together with the lower side plate of the clamp body to clamp a bus-bar. The locking mechanism is used for locking the worm to fix the position of the moving pressure plate. The device can be operated with the help of an insulated pull rod, without the need for climbing. A bus-bar and the grounding line can be connected firmly, and the grounding line is not easy to fall off, so good grounding is achieved.