The embodiment of the invention discloses a method for manufacturing an organic composite dielectric film, which comprises the following steps: evenly mixing polyvinylidene fluoride and polythiophene to obtain mixed powder; dissolving the mixed powder in an organic solvent to obtain an organic mixed solution; standing the organic mixed solution at room temperature in a vacuum for deaeration; and heating the organic mixed solution to volatilize the organic solvent, thereby obtaining the polythiophene-polyvinylidene fluoride organic composite dielectric film. The organic composite dielectric film prepared by the method disclosed by the embodiment of the invention has the advantages of higher dielectric constant, high flexibility and favorable working properties; and the method disclosed by the embodiment of the invention is simple to operate and low in cost, and is suitable for producing film capacitors.