The invention relates to a reduction and utilization method of dedusting ash of stainless steel, comprising the following steps of: (1) preparing materials: uniformly stirring and mixing raw materials into a mixed material according to following proportions: 90-95 dedusting ash, 2-4 reducing agent and 3-6 bonding agent; (2) extrusion formation: pressing the mixed material into dedusting ash pressure balls; (3) maintaining: naturally drying and maintaining the dedusting ash pressure balls, wherein the measured intensity of the pressure balls is 2420N / each ball-2820N / each ball; (4) sintering: adding the dedusting ash pressure balls into a rotary kiln, sintering at 650+ / -50 DEG C for no less than 20 minutes, and discharging; (5) preparing materials for an electric furnace according to the following proportions: 70-80 stainless steel waste steel, 35-40 high-carbonferrochrome, 40-45 pig iron containing chromium and nickel, 3-5 dedusting ash pressure balls, 6-8 slag former and 0.3-0.5 reducing agent; and (6) melting: adding the prepared materials into the electric furnace for melting, and tapping when the temperature and the components of the molten steel meet the requirement. The reduction and utilization method of the dedusting ash of stainless steel has the advantages of low cost and little pollution to the environment.