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The application discloses a metal-loaded vertical array light lanthanum fluoride-based nanosheet catalytic membrane and a preparation method, and belongs to the technical field of catalytic membrane materials. The catalytic membrane comprises a base film, a light lanthanum fluoride-based nanosheet array in-situ vertically grown on the surface of the base film, and metal active species loaded in pores. The catalytic membrane prepared by the application has a uniform distribution and a topological structure nanosheet vertical light lanthanum fluoride-based nanosheet array layer grown on the surface, and simultaneously loads metal active species catalysts in the array layer. The catalytic membrane exhibits high catalytic activity and stability in the field of heterogeneous Fenton catalysis, photocatalysis, and photo-Fenton synergistic catalytic degradation of organic pollutants in water bodies, and the catalytic membrane is easy to separate from wastewater and can be recycled.