The invention belongs to the field of strip surfacing, and particularly discloses a strip surfacing method for a flange of gasification furnace equipment. The strip surfacing method for the flange of the gasification furnace equipment comprises the steps: during surfacing of a sealing surface, a baffle ring is subjected to spot welding on the inner wall of the flange; and during the surfacing of the inner surface, a shell ring is subjected to the spot welding on the sealing surface and is used for blocking a flux and for transition surfacing. The effect that the flange of the gasification furnace equipment is accomplished by automatic strip surfacing wholly is realized, the surfacing quality and the appearance forming are ensured, and the surfacing efficiency is improved.