Corn straw fiber and PVA are both degradable materials. In order to expand their application fields, the film-forming process and properties after film-forming were studied. The nano corn straw fiber (CSF) suspension was prepared by ball milling and then oxidized, which was mixed with PVA to be casting. The tape casting process and the tensile strength, transparency and permeability of the films were studied. With the increase of casting speed, the tensile strength first increases and then decreases, and the temperature settings of 90, 70 and 30 ℃ in three temperature zones can ensure good film quality; with the increase of CSF content, the barrier property of the film gradually becomes better, but the transparency decreases. The casting speed, temperature and other process parameters directly affect the quality and performance of the film. The content of CSF has an important influence on the barrier and transparency of the film.