The invention provides a method for deacidifying a paper by electro-adsorption. The method comprises S1, contacting a paper to be treated with a water absorbent pad so that the paper to be treated iswetted by water in the water absorbent pad containing water, and S2 placing the wet paper and the water absorbent pad contacting with the paper between an inert anode plate and an inert cathode plate,wherein a porous carbon material is paved on the surface of the inert anode plate, and carrying out electro-adsorption through direct currents to obtain the deacidified paper. The electrosorption deacidification speed of the method is much faster than that of the traditional aqueous solution method and one process takes only a few minutes so that the negative impact of the traditional soaking anddeacidification technology on the paper is greatly reduced. The method is suitable for treatment on a single sheet, multiple sheets and whole book and realizes precise control of pH. The method has the advantages of simpleness, reliability, environmental friendliness, safety and low cost and solves the problem that a wet state in a long time may cause paper deformation, writing fading and ink penetration.