Adsorption and removal method for low-concentration sulfur dioxide and fine dust in flue gas

The invention relates to a method for adsorbing and removing low-concentration sulfur dioxide and dust in flue gas, and relates to a method for adsorbing and removing sulfur dioxide by transforming macroporous weak-acid cation exchange resin into weak-alkaline resin, which comprises the following specific steps of: washing, cooling and humidifying the flue gas, introducing the flue gas into an adsorption column filled with the macroporous weak-acid cation exchange resin; the resin is filled in the form of a bundling bag or a random packing bag, or is filled in a mixed manner in the form of combination of the bundling bag and the random packing bag. In the adsorption process, resin particles slowly shrink and are discharged out of a bisulfite solution, and the bisulfite solution can be used as a byproduct or is harmlessly discharged after being oxidized. In addition, the resin layer can intercept and capture small-particle dust in the flue gas, and the dust removal effect is achieved. Resin can be regenerated