The application discloses wear -resisting extension of strenghthened type ring, should extension ring including the integrated main part of long circle, the centre of this integration main part is equipped with long circular hole, integrated main part includes upper and lower straightway and left and right segmental arc, the shape of upper and lower straightway, big or small homogeneous phase together, the shape of left and right segmental arc, big or small homogeneous phase together, and the thickness of segmental arc is greater than the thickness of straightway. The application provides an extension ring has increased the thickness of segmental arc contact point, make resistant friction properties show and improve, has effectively reduced the gold utensil and the line accident because ofwhat wearing and tearing, fracture leaded to, has reduced the circuit maintenance frequency, makes circuit routine maintenance cost reduction, has guaranteed the safe operation of circuit.