Abstract: An extruded solar power back panel: an inner, middle, and outer layer arranged from the inside to the outside sequentially with a mass ratio of 10-40:40-80:10-40. Total thickness of the extruded solar power back panel is 0.1-0.6 mm. Highly rigid polypropylene added to inner layer ensures the bonding force between back panel and adhesive film, and improves inter-layer bonding force between back panel and polypropylene material in middle layer. Polyethylene, or a co-polymer thereof, added to the middle and outer layers, achieves excellent adhesion to polyethylene in inner layer, further improving inter-layer bonding force and low temperature thermal shock resistance of back panel. Added grafting material improves uniformity and inter-layer bonding force of product, increases the surface tension of back panel after corona treatment, and increases bonding force between back panel and silica gel used for sealing frame of solar cell.