The invention provides a film coating member, which comprises a base material, a bottom coating formed on the surface of the base material, a metal iridium layer formed on the surface of the bottom coating, a chromium oxynitride layer formed on the surface of the metal iridium layer and a chromium nitride layer formed on the surface of the chromium oxynitride layer. The film coating member provided by the invention has good transition of the film system and there is no obvious stress generated inside the film; the metal iridium layer has good high temperature antioxidation performance; and the chromium oxynitride layer is compact and can effectively postpone diffusion of extraneous oxygen into the film. With the combined effect of the metal iridium layer and the chromium oxynitride layer, the base material can be protected from being oxidized at high temperature, so as to effectively raise service life of the film coating member. In addition, the invention also provides a preparation method of the above film coating member.