The invention provides a method for producing manganese sulfate by cyclically utilizing low-concentration sulfur dioxide smoke in an aluminum electrolysis cell. The invention relates to low-energy-consumption resource utilization for low-concentration SO2 smoke treatment and waste treatment in the aluminum electrolysis industry, belonging to the fields of energy saving, emission reduction and environmental protection. The method provided by the invention comprises the steps as follows: a chimney subjected to anti-corrosion treatment for exhausting aluminum electrolysis cell smoke is used as atwo-stage absorption tower; an aqueous solution containing MnO is used as an absorption solution; the exhausted SO2 smoke is directly absorbed by adopting an atomization spray and cyclic absorption mode; the nearly saturated solution containing 10-50wt% of manganese sulfate, generated in the reaction, is prepared into a manganese sulfate product through filtration, multiple-effect evaporation andflash vaporization crystallization; and after the residual sulfuric acid mist in the smoke is subjected to demisting treatment, the smoke is exhausted in accordance with the standards. The method provided by the invention can provide technical support for solving the high-standard exhaust problem of the low-concentration SO2 smoke in the aluminum electrolysis cell, enables harmful constituents inindustrial waste gas to be effectively utilized, realizes the sustainable development of resources and environments, has the advantages of low engineering investment, high SO2 absorption efficiency and low operation energy consumption, and can meet higher requirements for environmental protection and exhaust in accordance with the standards.