The utility model relates to an accessory of roofbolt in the pit that the coal seam gas well was used, specifically speaking are spiral grafting centralizer of coal seam gas well. Including half one on a left side and half right one, half one on a left side is the same with half right bilge construction, the inboard semicircle cambered surface that contacts with the sucker rod that all is equipped with, and the outside all is equipped with the heliciform rib, half both ends with half one on the right side on the left side are equipped with and are used for the fixed grafting structure of pegging graft. The utility model discloses with the mode of pegging graft, combine the bonding agent to bond, fix on the sucker rod body, play the improvement centralizer and right the abrasionproof effect to reduce the interior liquid flow resistance of oil pipe, reduce the effect of beam -pumping unit load subalternation.