NOVELTY - Solar battery back board comprises a polyethylene terephthalate (PET) substrate (1). A modified polyamide 6 (PA6) film layer (3) adhered by a first adhesive layer (2) is arranged on the back side of the PET substrate. A modified polyethylene (PE) film layer (5) adhered by a second adhesive layer (4) is arranged on the front side of the PET substrate.    USE - Used as a solar battery back board.    ADVANTAGE - The back board: has good mechanical property, heat resistance, wear resistance, chemical resistance, flame resistance and puncture resistance performance; has oxygen and carbon dioxide barrier properties; has electrical insulating and scratch resistance property; and is easy to process and has long service life.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for producing the solar battery back board, comprising (i) according to the color and thickness of the back board to be produced, adjusting the ratio of polyurethane, polyurethane fixing agent and diluent butyl acetate to control the concentration and viscosity of the adhesive; (ii) uniformly coating the adhesive the both the sides of the PET substrate by using a double-roller coating machine; (iii) placing the coated PET substrate in an oven for drying and solidifying, where the drying temperature is 55-65 degrees C and the drying time is 2-3 minutes; (iv) placing the modified polyamide 6 film layer on the back side of the PET substrate and the modified polyethylene film layer on the front side of the PET substrate; (v) winding, cutting into a specific length, drying and airing for 2-4; (vi) cutting the back board according to the required width and length; and (vii) sampling and testing the performance of the back board.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic representation of the solar battery back board.    Polyethylene terephthalate substrate (1)    First adhesive layer (2)    Modified polyamide 6 film layer (3)    Second adhesive layer (4)    Modified polyethylene film layer (5)