The study was to thoroughly investigate the weather resistance of polyethylene for rotational molding under different conditions, and to comprehensively understand the changing rules of their structure and performance. The structure and properties of polyethylene rotational molding special materials were investigated under different xenon lamp aging levels by using scanning electron microscopy (SEM), infrared spectroscopy (FTIR), differential scanning calorimetry(DSC), and other characterization methods. The results show that with the increase of xenon aging time, the surface morphology of the rotational plastic undergoes significant deformation and cracking, while the intensity of the internal carbonyl characteristic peaks also shows an increasing trend. The xenon lamp aging causes a significant shortening of the oxidation induction period of the rotational plastics. However, the rotational plastics show relatively stable characteristics in terms of melting and crystallization temperatures and processing properties. In addition, the yield stress of the rotational plastics increases, while the strain at fracture, stress at break and tensile strength show a decreasing trend. The experimental data in this study provide detailed information on the weather resistance of polyethylene for rotational molding, offering references for further optimizing product performance and applications.