The invention discloses a preparation method for a graphene/metal based composite film material. The preparation method comprises the following steps that an electric conduction base is selected and washed, and a graphene thin film layer is grown on the washed electric conduction base; and the graphene thin film layer is washed, a metal layer is then grown on the graphene thin film layer, and then the graphene/metal based composite film material is prepared. The preparation method has the beneficial effects that the process is simple, the reaction condition is mild, and the graphene doped proportion is controllable; and according to the prepared composite film material, on the premise that the electrical property is guaranteed, the good mechanical property and corrosion and oxidation resistance are achieved, growth of intermetallic compounds can be effectively prevented, and the preparation method is suitable for the fields of surface coating, electronic packaging and the like.