Sulfur dioxide (SO2) emissions must be efficiently controlled owing to environmental demands. An interesting approach for SO, concentration is the use of ionic liquids (ILs) and subsequent detection by electrochemical methods. In this study, two kinds of IL ([EMIM] [TfO] and [EMIM] [BR4]) have been shown to absorb and desorb SOS, and the electrochemical behavior has been investigated by using nanoscale molybdenum disulfide (nano-MoS2)-modified electrodes. The corresponding absorption results showed that the MoS2-modified electrode is a good sensor for SO, and that the ILs have a high SO, absorption capacity. According to the SO, desorption results, it was shown that desorption can be completed at approximately 140 degrees C under vacuum. Based on the high response signal of this modified electrode to SO2 it was utilized to detect the SO, in haze. The results suggested that [EMIM] (TfO) is able to absorb SO, from haze with a higher selectivity and capacity than [EMIM] BF4]. Meanwhile, the MoS2-modified electrode was used to detect the concentration of SO, in the air, which was consistent with the official results.