The invention discloses a processing method of an electrode foil used for an aluminum electrolytic capacitor. The method comprises pre-processing, corrosion, postprocessing and multistage formation. The method is characterized in that in each stage of formation, an asymmetrical intermittent positive and negative combination pulse power up mode is used to carry out formation. Compared with an existing continuous power up formation mode, by using the method of the invention, the quality of a formed foil can be greatly improved, boost time is shortened, a leakage current is reduced and formationefficiency is increased.