Electrochromic film and preparation method and application thereof

The invention relates to the technical field of organic photoelectric functional materials, in particular to an electrochromic film and a preparation method and application thereof, and the preparation method of the electrochromic film comprises the following steps: dissolving a soluble polymer in an organic solvent to prepare a polymer solution A; dropwise adding the polymer solution A into an aqueous solution B in which a surfactant is dissolved under a stirring condition, and fully stirring to prepare a mixed solution C; performing ultrasonic treatment on the mixed solution C to obtain a miniemulsion D, and evaporating to remove the organic solvent in the miniemulsion D; and dialyzing to remove the redundant surfactant in the emulsion D, and filtering to obtain the water-dispersed polymer ink. And taking conductive glass as a substrate, spraying the prepared ink on the surface of the substrate, and drying to obtain the electrochromic film. The obtained film is in a nano-particle form, the ion diffusion rat