a medical instrument and a manufacturing method thereof are provided . the medical instrument includes a biomedical metal layer and a polymer film . the polymer film is a biodegradable polymer material . the manufacturing method includes the following steps : providing the biomedical metal layer , immersing the biomedical metal layer in a polymer solution , performing a baking process on the biomedical metal layer coated with a polymer film , forming the biomedical metal layer coated with the polymer film , taking out the biomedical metal layer coated with the polymer film to fabricate the medical instrument . the biodegradable polymer film and the biomedical metal layer are combined into the medical instrument , so that a physician performs a surgery more easily . in addition , decomposition time of the polymer film can be preset , so as to achieve efficacy of blocking soft tissue cells having a higher growth rate .