A process for preparing anode foil with high specific capacity and low contact resistor, used for high-performance electrolytic capacitor, features that 30-50 Hz sine waves are used to induce corrosion holes, the corrosion liquid is prepared from hydrochloric acid as main component, nitric acid, phosphoric acid, oxalic acid and efficient corrosion retardant, and Al corrosion takes place at 30-50 deg.C. Its advantages are ideal induced caves, less corrosion depth and large active area.