The embodiment of the invention provides a thin film aperture and a thin film module, and relates to the field of optics, wherein the thin film aperture comprises a first substrate, a second substrate, an aperture layer and a transparent electrode, the first substrate and the second substrate are oppositely arranged, the aperture layer is located between the first substrate and the second substrate, and the transparent electrode is located at at least one side of the aperture layer and is used for inputting an electric signal to the aperture layer. The aperture layer comprises colored electrophoretic particles flowing freely and transparent suspension liquid, and the colored electrophoretic particles directionally move in the transparent suspension liquid under the action of electric signal, so that the aperture layer is in a full-light-absorption state, a semi-light-absorption and semi-light-transmission state and a full-light-transmission state. According to the scheme, the thin filmaperture can selectively present light absorption and light transmission states, the aperture is changed to change the luminous flux, the size of the aperture is greatly reduced, and the light and thin design of the aperture can be realized.