A method and apparatus for nucleic acid purification using an ion-permeable polymer-coated electrode are provided. The method for nucleic acid purification according to the present invention comprises the steps of exposing a fluid sample containing nucleic acids to an electrode coated with an ion-permeable polymer, applying a voltage to the electrode to attach the nucleic acids in the fluid sample thereto, removing the residual fluid sample from the electrode carrying the nucleic acids, and eluting the nucleic acids attached to the electrode into a buffer. The apparatus comprises an electrode coated with an ion-permeable polymer; and a voltage applying device for applying a voltage to the electrode.