The utility model relates to an insulation wire middle wire stripper comprising a pedestal, a fixing piece, a movable piece, knife cores and a screw rod; mutually matched one knife core is respectively arranged in the fixing piece and the movable piece; a knife core cross section is a semicircle shape; a trapezoid concave-convex groove is arranged between knife core matching portions; two ends of the knife core are respectively provided with a section cutting sheet; a slice is arranged between the section cutting sheets; when the wire is placed in a center of the knife core, the two knife cores are combined to form an extrusion force, so a knife core section cutting sheet and the slice can insert an insulation sleeve of the wire; when the knife cores are combined, the wire insulation sleeve is separated along an insertion line of the cutting sheet and the slice, thus easily removing sleeve spalling objects.