Formation method of anodic aluminum foil

The invention discloses a formation method of anodic aluminum foil, which comprises the following steps: preprocessing; energizing by multi-stage voltage to form an oxide film on the surface of the aluminum foil; and repeatedly damaging and repairing the oxide film. The processes of energizing by multi-stage voltage and repeatedly damaging and repairing are carried out in weakly acidic tank liquor of different concentration; and before and after the aluminum foil enters different weakly acidic tank liquor every time, the aluminum foil needs to be washed by water to clear the acid liquor residues on the surface of the aluminum foil, wherein in the water washing method, pure water is firstly used for cooling the front section, and the pure water is directly used for cleaning the back section. In the formation method of anodic aluminum foil, which is provided by the invention, the pure water is directly used for cooling the front section, and the heated pure water is directly used for cleaning the back section, thereby ensuring good cleaning effect, saving heat and water and reducing the production cost.