Photovoltaic backboard

The invention relates to the photovoltaic field, in particular to a photovoltaic backboard which sequentially comprises a weather-proof layer, a backboard base material and a weather-proof self-cleaning layer from top to bottom, and the weather-proof layer, the backboard base material and the weather-proof self-cleaning layer are bonded and fixed through bonding layers. Wherein the weather-proof self-cleaning layer contains hydroxyl-terminated polydimethylsiloxane, a nano oxide and a fluorine-containing silane coupling agent at the same time. The weather-proof self-cleaning layer is introduced into the photovoltaic back plate, so that the photovoltaic back plate has good weather-proof performance and self-cleaning effect, pollutants can be taken away by means of flowing of rainwater and are difficult to stay on the surface of the back plate, and the aesthetic degree and the light utilization rate of an assembly are guaranteed; meanwhile, the cleaning layer composed of the hydroxyl-terminated polydimethylsilox