The utility model relates to an insulator crossarm, including " L " type support body, clamping frame, crosslinked polyethylene layer, polyvinyl chloride layer, wear -resisting leather packing, " L " type support body includes vertical plate, diaphragm, the vertical plate both ends are equipped with a horizontal hole respectively, the vertical plate middle part is equipped with vertical hole, vertical plate is last to be lain in vertical hole both sides still symmetrical formula are equipped with a pair of fixed orifices, diaphragm length direction both ends are equipped with an at least through -hole respectively, clamping frame is equipped with a pair ofly, the establishing of a pair of clamping frame symmetry formula vertical plate keeps away from on the terminal surface of diaphragm, " L " type support body, clamping frame's surface is equipped with the crosslinked polyethylene layer, crosslinked polyethylene layer surface is equipped with polyvinyl chloride layer, wear -resisting leather packing is established on the polyvinyl chloride layer of clamping frame surface, the utility model discloses can pass through the insulation of crosslinked polyethylene layer, polyvinyl chloride layer realization cross arm, can also increase the wearability through wear -resisting leather packing, prevent the polyvinyl chloride layer wearing and tearing.