Mixed matrix membrane as well as preparation method and application of mixed matrix membrane

The invention discloses a mixed matrix membrane as well as a preparation method and application of the mixed matrix membrane. The mixed matrix membrane comprises a base material and packing, wherein the base material is polyetherimide and the packing is a molecular sieve; the polyetherimide is selected from one or more of polyetherimide represented by a formula I shown in the specification, wherein A is described in the specification; Z is described in the specification; R is H, CH3 or OCH3; and B is -O-, -CH2-, -CO-, -SO2- or a formula shown in the specification. The mixed matrix membrane takes polyetherimide as the base material so that a polar ether oxygen group in polyetherimide can be sufficiently utilized so as to improve the selectivity of CO2; meanwhile, the molecular sieve with an interconnection pore structure is used as the packing so that the infiltration capacity and the selectivity of gas can be improved and the gas separation performance is excellent. Therefore, the mixed matrix membrane has high selectivity and good gas permeability.