The invention provides a gas trapping agent, and a preparation method and application thereof. The gas trapping agent comprises a main solvent, an adsorbent and a co-solvent, wherein the main solventis 1,3-dimethylpropyleneurea, the adsorbent is a zeolite imidazole ester skeleton material, and the co-solvent is cyclohexane and/or a cyclohexane derivative. The gas trapping agent provided by the present invention has low viscosity, fast mass transfer, fast desorption speed, no easy foaming and high slurry regeneration performance, and can be used for separating gases such as dry gas, natural gas, coke oven gas, flue gas, coal seam gas and the like of a refinery plant.