Provided is a system for producing sodium pyrosulfite. The system comprises a third reactor (1), a second reactor (3) and a first reactor (5), wherein a sodium carbonate storage bin (13) is separately connected to an alkali preparation tank (8) and an alkali liquor tank (10); the output end of the alkali preparation tank (8) is connected to the upper portion of the third reactor (1); the lower output end of the third reactor (1) is separately connected to a jet reactor positioned at the top of the third reactor (1) and the upper portion of the second reactor (3) by means of a third circulating pump (2); the lower output end of the second reactor (3) is separately connected to a jet reactor positioned at the top of the second reactor (3) and the upper portion of the first reactor (5) by means of a second circulating pump (4); the lower output end of the first reactor (5) is separately connected to a jet reactor (22) positioned at the top of the first reactor (5) and an elutriation tank (18) by means of a first circulating pump (6); and the elutriation tank (18) is sequentially connected to a centrifugal machine (19) and a drying machine (20). The sodium pyrosulfite prepared by the system has a good quality, a new process flow and low energy consumption, and has wide popularization and use values.
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