The invention discloses a yoke plate tightener for overhead line stringing. The yoke plate tightener comprises a V-shaped body, wherein the V-shaped body comprises two landing legs, and each landing leg is provided with a hook; the two landing legs comprise the first landing leg and the second landing leg, wherein the first landing leg is provided with a fixed plate, and the fixed plate is provided with a fifth through hole which penetrates through the fixed plate in the thickness direction of the fixed plate; the joint of the two landing legs of the V-shaped body is of an arc shape. The yoke plate tightener for overhead line stringing has the advantages of enabling a hauling cable and double-string porcelain insulators to be reliably connected, being capable of improving safety and reliability of electric transmission line conductor stringing, improving stringing efficiency and lowering labor intensity of workers on towers, reducing the number of the workers, being low in construction difficulty and the like.