The invention relates to an analysis method for the microscopic morphology of the surface porous oxidation film of an aluminum foil. The method comprises: carrying out high-temperature melting treatment on a formation pre-treatment aluminum foil sample, forming a certain included angle between the formation pre-treatment aluminum foil sample and the bottom of a heating container during the treatment process, flowing to the lower part by aluminum liquid under the action of gravity, carrying out cooling, and separating the aluminum from the aluminium oxide to obtain a porous oxidation film; andplacing the porous oxidation film in a scanning electron microscope or an electron lens for analysis to obtain microscopic morphology parameters. According to the analysis method provided by the invention, high-temperature melting is performed on the aluminum foil having the surface with the non-acid-alkali-resistant aluminum oxide film; the aluminium oxide film is stripped; and then the analysisis performed to obtain microscopic morphology parameters, thereby providing the data support for formation mechanism study. Moreover, the stripping process is simple and is easy to control and the method is suitable for the analysis of the porous oxide film morphology of the surface layer to carry out basic research.