In order to remove effectively the triazine herbicides, a kind of functional microflitration membrane is prepared.Chloromethylated polysulfone (CMPSF) microfiltration membrane was firstly modified into aminated membrane (AMPSF membrane). The –NH2/S2O82- redox initation system was constitued via the amino groups on AMPSF membrane and ammonium persulphate as initator in the solution, which initated monomer sodium p-styrenesulfonate (SSS) graft-polymerize on the AMPSF microfiltration membrane, resulting in the functional grafted-membrane PSF-g-PSSS. The structure of PSF-g-PSSS was measured by FT-IR and the morphology was observed by SEM. The isothermal adsorption experiments of PSF-g-PSSS membrane for three triazine herbicides, ametryn, prometryn and atrazine, were carried out in detail to estimate isothermal adsorption property and the mechanism of PSF-g-PSSS membrane for triazine herbicides. The rejection and removing performance of PSF-g-PSSS membrane for triazine herbicides from water were further studied by the permeation experiments. The results show that the electrostatic interaction between PSF-g-PSSS membrane and triazine herbicides leads to high adsorption capacity and rejection performance. As a filter with a membrane area of 78.5 cm2 is used, the rejection rate of PSF-g-PSSS membrane for ametryn solution with a concentration of 1 mg/L at 0.1 MPa can be closed to 100% until the volume of permeation solution reaches 2.5 L, displaying an excellent rejection and removing performance towards triazine herbicides.