The invention belongs to the technical field of surface engineering, and particularly relates to an electrochromism film with the stable performance and a preparation method thereof. The film system structure of the film sequentially comprises a substrate, a conductive electrode, an ion storage layer, a transition layer, an electrolyte layer, a transition layer, an electrochromism layer and a transparent conductive layer from bottom to top, and the section of the film system is the transparent protective layer. According to the electrochromism film with the stable performance, the interface and the environment are blocked by depositing a protective layer on the section of the film system of the electrochromism film, the electrochromism film has the stable color change performance in the ground environment and the space environment, performance degradation cannot happen, and the good circular stability and environment stability are achieved. According to the electrochromism film, the transition layer is additionally arranged between the coloring layer and the electrolyte layer, on one hand, leakage current is lowered when the transition layer is adopted as an electron barrier layer,and the coloring memory effect is improved; on the other hand, the voltage value needed by electrochromism is lowered, and the circular stability is improved.