For　anodized　aluminum,　the　enhancement　of　the　specific　capacitance　foils　by　increasing　dielectric　constant　is　one　of　the　most　common　methods　to　meet　the　requirements　of　miniaturization　and　lightweight　of　aluminum　electrolytic　capacitors.　In　this　study,　surface　self-assembly　method　was　used　to　introduce　sulfonic　acid　group　to　graft　the　surface　of　aluminum　foil　for　changing　its　electrical　properties.　Electrostatic　repulsion　between　surface　of　aluminum　foil　and　colloidal　particles　of　titanium　dioxide　was　changed　to　electrostatic　forces　due　to　the　existence　of　sulfonic　acid　group,　which　dramatically　enhanced　the　deposition　of　titanium　dioxide　on　the　surface　of　the　aluminum　foil.　After　heat　treatment　and　anodic　oxidation　of　aluminum　foil,　the　Al2O3/TiO2　compounds　with　high　dielectric　constant　on　the　surface　of　aluminum　foil　were　prepared　successfully.　Comparing　with　those　without　TiO2　coating,　the　content　of　Ti　on　the　surface　of　anodized　aluminum　foil　prepared　by　surface　self-assembly　method　increased　by　30　times　while　the　specific　capacitance　of　anodized　aluminum　foil　was　enhanced　by　44.26%　at　the　withstanding　voltage　of　400　V.　Therefore,　anodized　aluminum　foil　with　a　high　specific　capacitance　prepared　by　above　method　exhibits　great　potential　in　commercial　application　of　aluminum　electrolytic　capacitor　in　the　future.