The invention discloses a method for preparing a functional thin film through electrophoresis by using conductive ceramic as a substrate. The method comprises the following steps: 1, providing a material A and a material B; 2, adding the material A into the material B to form a solution or suspension; 3, adding a material C as required to form a mixed solution; 4, connecting an electrophoresis device with a stabilized voltage power supply for electrophoresis; and 5, airing or drying the conductive ceramic subjected to the electrophoresis to obtain the functional thin film. According to the method, the conductive ceramic is used as the substrate serving as an electrophoresis electrode, so that a rigid matrix is provided for the functional thin film formed by the electrophoresis; the conductive ceramic can be thermally treated together with the functional thin film, so that a noble metal electrode of expensive platinum or the like is avoided, the production cost is reduced, and the quality of the prepared functional thin film is excellent.