NOVELTY - Substrate for flexible photoelectric device comprises a flexible substrate and a conductive layer, where the structural composition of substrate comprises (i) the flexible substrate as an ultraviolet (UV) light curable silicone adhesive, and the conductive layer as a silver nanowire thin film, whose gap is filled with graphene, or (ii) the flexible substrate as a graphene-doped UV-curable silicone adhesive, and the conductive layer as the silver nanowire thin film, whose gap is filled with graphene-doped UV-curable silicone adhesive.    USE - Used as a substrate for the flexible photoelectric device.    ADVANTAGE - The substrate solves the problem of high roughness of the silver nanowire thin film; improves the conductivity of the silver nanowire thin film and the flatness of the surface; and increases the binding force between the silver nanowire thin film and the flexible substrate.    DETAILED DESCRIPTION - Substrate for flexible photoelectric device comprises a flexible substrate and a conductive layer, where the structural composition of substrate comprises (i) the flexible substrate as an ultraviolet (UV) light curable silicone adhesive, and the conductive layer as a silver nanowire thin film, whose gap is filled with graphene, or (ii) the flexible substrate as a graphene-doped UV-curable silicone adhesive, and the conductive layer as the silver nanowire thin film, whose gap is filled with graphene-doped UV-curable silicone adhesive, where the UV-curable silicone adhesive comprises (in wt.%) photosensitive polysiloxane (92-99.5), a photoinitiator (0.1-5), a diluent (0.4-6) and an auxiliary agent. An INDEPENDENT CLAIM is also included for preparing the substrate comprising (i) cleaning a rigid base plate whose surface roughness is less than 1 nm, and drying after cleaning with dry nitrogen, (ii) using spin coating, spray coating, assembling, ink jet printing or screen printing for preparing the silver nanowire thin film on the clean substrate, (iii) spin coating or spray coating the silver nanowire thin film with the UV light curable silicone adhesive doped with graphene, or by first spin coating, drip painting or spray coating the graphene-containing solution, and then spin coating, drip painting or spraying the UV light curable silicone adhesive layer, (iv) processing of UV solidification of the rigid base plate surface for 30 seconds, (v) forming the flexible conductive substrate by the silver nanowire thin film and the solidified UV light curable silicone adhesive layer or the UV light curable organic silicone adhesive layer doped with graphene, which are peeled-off from the rigid base plate surface, and (vi) testing the transmittance, electrical conductivity of the flexible conductive base plate, and each parameter of the surface appearance.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic representation of the substrate.