The present invention relates to the field of production of chemical products, and in particular relates to a sodium metabisulfite production method which is as follows: sulfur is sent by compressed air into a combustion furnace for combustion at 600-800 DEG C, air addition amount is about 2 times of the theoretical amount, gas SO2 concentration is 10%-13%, after cooling dust removal and filtration, sublimed sulfur and other impurities are removed, gas temperature is reduced to about 50 DEG C, the gas is introduced into a tandem reaction barrel, mother liquor and sodium carbonate are added slowly into a pulp storage barrel, a sodium sulfite suspension generated from the sodium carbonate is dissolved, and a sodium metabisulfite crystal can be produced by successively passing through a third, a second and a first reactor for absorption reaction with SO2; sodium metabisulfite prepared by the method is high in purity, utilization rate of raw materials is high, the production process is simple and easy to operate, the mother liquor and energy can be repeatedly recycled, invalid consumption of the production process can be reduced, the purpose of energy conservation and emission reduction can be achieved, production cost is reduced, and economic benefits are improved significantly.