Middle wire stripper for insulated wire

The invention relates to a middle wire stripper for an insulated wire. The middle wire stripper comprises a base, a fixed block, a movable block, knife cores and a screw. The knife cores matched with each other are arranged in the fixed block and the movable block respectively. The cross section of each knife core is of a semi-circular-ring shape. A trapezoidal concave-convex groove is formed between matching parts of the knife cores. Fan-shaped truncation pieces are arranged at the two ends of each knife core. Cutting pieces are connected between the fan-shaped truncation pieces. When the wire is placed into the central parts of the knife cores, the two knife cores are combined to generate extrusion force to make the truncation pieces and the cutting pieces of the knife cores be inserted into an insulating sheath of the wire, after the knife cores are combined, the insulating sheath of the wire is separated according to the insertion line of the truncation pieces and the cutting pieces, and then exfoliation of the sheath can be taken out easily.