The invention relates to loaded type ion liquid for absorbing SO2 gas and a preparation method thereof. The loaded type ion liquid is [R1Mim]R2-X, wherein Mim is methylimidazole, R1 is CH3(OCH2CH2)n; R2 is one of 20 types of common amino acids; and a carrier X is active carbon fibers or active carbon. The loaded type ion liquid integrates dual advantages of ether group functionalized ion liquid and a porous material, and the disadvantages of the ion liquid that the viscosity is great, the cost is high and the like are overcome; the adsorption effect on SO2 is greatly improved; the loaded type functionalized ion liquid adopts a chemical bonding manner so that the loss of the ion liquid in an application process is avoided; an adsorbent is easy to regenerate and recycle so that the use amount of the ion liquid is greatly reduced and the cost is lowered; and the loaded type ion liquid for absorbing the SO2 gas is advantageous in the aspect of industrial application.