The invention discloses a manufacturing method of a high-dielectric-constant composite oxide film electrode foil. The method comprises the following steps that the aluminum foil subjected to surface expansion corrosion is prepared; in a 50 to 70 DEG C tetrabutyl titanate and ethylene glycol monomethyl ether mixed system prepared by a collosol-gel method, electro-deposition is performed for 0.5 to 2 minutes at the direct current voltage being 5 to 10V and the current density being 30 to 60mA/cm<2>; drying is performed for 3 to 5 minutes at the air atmosphere of 100 to 200 DEG C; 400 to 600 DEG C high-temperature treatment is performed for 1 to 24h in a protection gas atmosphere state under the pressure of 1 to 3atm; forming production is performed. The method has the advantages that the method is simple and is easy to control; the existing corrosion and formed foil production process is not influenced; compared with the foil produced by the traditional process, the produced foil treated by the process has the advantage that the specific volume is improved by 20 percent or higher.