NOVELTY - Backplate comprises a metal foil layer, a first adhesive, a first weather resistance layer, a base material, and a second weather resistance layer. One side of the first weather resistance layer and the metal foil layer is fixedly connected via the first adhesive, and the other side is fixedly connected to the one side of the base material. The other side of the base material is fixedly connected to the second weather resistance layer.    USE - The backplate is useful for back field passivated type solar cell.    ADVANTAGE - The backplate has good weather resistance performance, protects the solar cell assembly by UV light and water vapor, reduces the shading area, improves the conversion efficiency and eliminates the need of conventional process in silicon welding circuit. The etching circuit of the metal foil layer can be used as electrode and has conductive function.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for producing the backplate, comprising (i) (ia) weighing (in wt.%) weather resistance resin (50-75), a solvent (10-20), a curing agent (5-15), a filler (5-30), a dispersant (0.5-2), an antioxidant (0.5-2), an anti-hydrolysis agent (0.5-2) and an anti-aging agent (0.5-2); (iib) uniformly mixing the part of the weather resistance resin and the filler via a sand mill to obtain mother liquor; and (iiic) mixing the mother liquor with remaining parts of weather resistance resin and remaining components of step (ia), and mixing uniformly to obtain coating material; (iia) coating the adhesive on one side of the surface treated base material, performing primary thermal curing, coating the product of step (iiic) on the surface of the adhesive layer, winding and performing thermal curing, or coating the product of step (iiic) on the surface of the surface treated base material, and winding and performing thermal curing to obtain the first weather resistance layer; and (iib) coating the adhesive on the other side of the surface treated base material, performing primary thermal curing, coating the product of step (iiic) on the surface of the adhesive layer, winding and performing thermal curing, or coating the product of step (iiic) on the surface of the surface treated base material, and winding and performing thermal curing to obtain the second weather resistance layer; and (iii) processing the surface of the first weather resistance layer via a machine head, coating the adhesive on the surface of the surface treated first weather resistance layer, winding and performing thermal curing, coating the metal foil layer on the surface of the adhesive layer, rolling and winding.