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This invention discloses a metal-organic framework material, its preparation method, and its applications, relating to the technical field of metal-organic framework materials. The metal-organic framework material prepared by this invention using specific metal nitrates, organic ligands, and solvents, combined with a solvothermal method, possesses a rigid three-dimensional framework structure and a hierarchical pore structure with periodically alternating narrow windows and larger pores. When used for the separation of C3F6 and C3F8, it exhibits advantages such as high selectivity, excellent low-pressure adsorption performance, good structural stability, low energy consumption, and the ability to be carried out under ambient temperature and pressure conditions. Furthermore, the separation of C3F6 and C3F8 can be achieved simply by passing a mixed gas containing C3F6 and C3F8 through a permeation column packed with the metal-organic framework material. The process is simple and has promising application prospects.