The invention discloses a method for catalyzing cycloaddition reaction of ternary heterocyclic compound and carbon dioxide. According to the method, a metalloporphyrin compound modified by imidazole ionic liquid is used as a catalyst, and cycloaddition reaction of ternary heterocyclic compound and carbon dioxid can be efficiently catalyzed with high selectivity under mild conditions. No solvent or cocatalyst is needed in the reaction process, the technology is simple, and the catalyst is easy to recycle.