The structure of the ultrafiltration membrane is symmetrical and asymmetrical. The former is isotropic, has no cortex, and the pores in all directions are the same, belonging to deep filtration; the latter has a dense surface layer and a bottom layer mainly composed of finger structures, and the surface layer thickness is 0.1 micron or less. And having ordered micropores, the bottom layer having a thickness of 200 to 250 microns, belonging to surface filtration. Ultrafiltration membranes used in industry are generally asymmetric membranes. The membrane materials of ultrafiltration membrane mainly include cellulose and its derivatives, polycarbonate, polyvinyl chloride, polyvinylidene fluoride, polysulfone, polyacrylonitrile, polyamide, polysulfone amide, sulfonated polysulfone, cross-linked Polyvinyl alcohol, modified acrylic polymer, and the like.