The invention discloses a method for preparing a high-density metal oxide membrane on a porous base material and relates to the field of methods for preparing a high-density metal oxide membrane, solving the technical problems that in the prior art, the high-density metal oxide membrane prepared on the porous base material is low in density and can not meet actual application. The method for preparing the high-density metal oxide membrane on the porous base material comprises the steps of 1, covering a layer of precursor solution on the porous base material; 2, applying an electric field and volatilizing a solvent; and 3, sintering. The method disclosed by the invention is applied in the fields of aviation, aerospace, machining and electronic information.