Abstract: The present invention relates to a method for plating the surface of polymer materials with a metal film by treating the surface of polymer materials with cold plasma method to introduce hydrophilic functional groups and then plating the surface of polymer materials with a metal film according to the electroless plating method. The cold plasma treatment reduces the contact angle of the surface of polymer materials to water by 5 to 60°. The surface of polymer materials can be more efficiently plated with the metal film by the additional step of either immersing the polymer material into an organic solvent for 0.1 to 5 minutes or washing the polymer material with ultrasonic washing machine after introducing the hydrophilic functional groups by treatment with cold plasma.