Polymer water treatment membrane and manufacturing method thereof

While securing the mechanical strength, chemical resistance and water permeability, and further an object to provide a polymer water treatment membranes having both antifouling property. Polymeric water consisting of vinyl chloride copolymer comprising a polymer water treatment film and vinyl chloride monomer and vinyl alcohol consisting of vinyl chloride copolymer containing a vinyl chloride monomer and a hydrophilic monomer as a structural unit as the structural unit a method of manufacturing a processed film, and molding a copolymer of vinyl chloride and vinyl acetate in a film form, the conversion of vinyl alcohol units of vinyl acetate units contained in the copolymer by hydrolyzing the process for producing a polymer water treatment membrane containing.