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This invention discloses a system for producing ammonium sulfite using electrolytic manganese ammonium sulfate double salt. The system includes a drum high-temperature drying device. The electrolytic manganese ammonium sulfate mixture output from the drum high-temperature drying device is fed into a crushing device via an elevator. The electrolytic manganese ammonium sulfate mixture output from the crushing device is fed into an anaerobic calcining furnace. A three-stage electrostatic precipitator is connected to the rear end of the anaerobic calcining furnace. The exhaust gas, after dust removal by the three-stage electrostatic precipitator, is sent to a multi-stage absorption and conversion tower via an exhaust gas pipeline. The conversion liquid and the completed absorption liquid after passing through the multi-stage absorption and conversion tower are sent to an evaporation device. This system and method for producing ammonium sulfite using electrolytic manganese ammonium sulfate double salt improves the calcination effect through pretreatment such as drying and crushing, and ultimately converts the ammonium sulfate into sulfur dioxide through anaerobic calcination to prepare ammonium sulfite. The difference lies in the direct blending and calcination method used in domestic and international processes.