Abstract: Aiming at the defects of mobile phone protective case under the traditional production methods and taking a mobile phone case as an example, an in-mold decorated mold for the mobile phone protective case was designed according to the requirements of in-mold decoration injection molding process. To facilitate the continuous production and protection of injection-molded products, a flip-chip mold structure was adopted, and a side core pulling mechanism was designed by using slanting rejecting and block mechanisms. The appearance surface was protected by adopting a latent thimble for glue injection, and a pressure bar mechanism was designed to fix the position of pattern film more accurately.