By taking the pure chitosan membrane into the pH-adjusted aqueous solution with the addition of base, adjusting the solution temperature, dissolving it by adding ammonium persulfate into the solution, starting the reaction by adding hydroxyl acrylamide into the solution, removing the modified chitosan membrane from the environment at the end of the reaction and cleaning it from impurities by washing with alcohol, washing the modified chitosan membrane with distilled water and keeping it in water until the next use; this invention relates to a method for the production of modified chitosan membranes with increased protein binding efficiency.