It is a cross-linked composite polyolefin photovoltaic packaging material made of polyolefin copolymer resin adding various necessary additives in accordance with a certain proportion. It has excellent water vapor barrier properties, can effectively bond glass, backplane and other materials for a long time, protect and fix solar cells, excellent electrical insulation properties, resistance to humidity, heat and ultraviolet aging properties, and can also protect and fix solar cells. Stable long-term anti-PID performance.