Silver plating production line is to be treated metal workpiece immersed in an electrolyte containing silver ions, through a DC electrogenic system, the positive and negative poles are connected to the workpiece to form an electric field, under the action of the electric field, the metal ions are reduced and adsorbed to the surface of the workpiece to form a layer of silver film. The silver plating line involves an electrochemical process and a reduction reaction of the metal, with the ultimate goal of forming a silver film on the surface of the metal workpiece.