The invention discloses a cathode plate for electrolysis with coating edges and a preparation method, and solves the problems of difficult separation of cathode depositions in the wet smelting electrolysis production process, unqualified physical appearances and chemical quality of products and high cost. A metal cathode electroplate assembly comprises a metal plate, an electric conducting rod and Teflon insulation edges. The Teflon insulation edges are cured on two side edges and the bottom edge of the metal plate according to a certain thicknesses and widths. The cathode plate has the following beneficial effects: the Teflon insulation edges of the cathode plate are not easy to scale in the production process to achieve cleaning, so that the accumulation of anode mud at the bottom edge is prevented, and the quality of electrolyzed products is improved; the insulation edges have no need to be frequently replaced, so that the production cost and the labor intensity are reduced; and the cathode plate has such characteristics as reasonable structure and good use effect.