The invention discloses an assistant tool which is designed to assemble and disassemble direct insert type fastener-special clamp for direct insert type fastener, comprising a clamp body cross movably connected and a handle fixedly connected with the clamp body; the clamp mouth is lengthening U-shaped and rectangular liners are inserted into the U shape, with two round holes with different apertures(large, small) corresponding to the main rod diameter of the direct insert type fastener arranged on each liner; the handle consists of a plurality of layers of casing which can be drawn out; the handle is provides with antislip embossing; a positioning spring is arranged behind the crossed connected movable supporting point; in practical use, since the upper and lower clamp mouths are symmetrical, the end with liner inserted is arranged against the circular-arc shaped cap and the U-shaped clamp mouth on the other side is exactly fastened to the hole on a side of the component. Energize inwards with the handle to push and press the inclined plane plug of the direct insert type fastener out from the round hole of the component and the clamp body of the U shape. The back coverboard inclined plane plug fastens and clamps the connected component to realize the connection or fixing of the component.