Insulation piercing wire clamp

The utility model relates to an insulation piercing wire clamp, which comprises a base, an upper cover, a blade, a rubber pad and a locking bolt assembly, the rubber pad is provided with a branch wire groove and a base wire fixing groove for positioning a main wire, the branch wire groove is internally provided with a through hole for positioning a branch wire and with a closed tail part, and the tail end of the through hole extends to form a fine hole with a gradually reduced diameter. According to the invention, the branch wire groove used for installing and positioning the branch wire is arranged on the rubber pad, the branch wire can be directly inserted into the branch wire groove for positioning during use, and the tail part of the through hole of the branch wire groove is provided with the thin hole with the diameter gradually reduced, so that the branch wire can be better clamped and positioned, and the service life of the branch wire is prolonged. A user does not need to worry that the branch line is