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The application discloses a kind of microporous polyimide anti-plasticizing gas separation membranes containing symmetric double benzimidazole and a preparation method thereof, belong to the technical field of polymer materials.The technical scheme includes that diamine monomer containing symmetric double benzimidazole group is dissolved in solvent, then acid anhydride monomer with porogenic element is added in batches, polyamic acid membrane is obtained by scraping after reaction, then imidization is carried out to obtain polyimide gas separation membrane containing symmetric double benzimidazole group.The application is applied to high-pressure or high-absorptive gas separation aspect, solves the problem that conventional polyimide gas separation membrane is easy to plasticize, can simultaneously improve gas separation performance and anti-plasticizing property.