Volatilization of lightweight components during long-term service is one of the main causes of bitumen aging. In this study, porous eggshell powder (EP) loaded with waste engine oil (LEPWEO) was prepared by the oil milling process, which released lightweight components during bitumen aging to improve bitumen aging resistance. The results showed that the pore volume of the EP was increased by 135.7 % after oil milling and waste engine oil (WEO) loaded in the pore was 16.41 wt%. Nano-pores and micron-pores were observed by transmission electron microscopy (TEM) and scanning electron microscope (SEM) tests, which were attributed to the crushing and compressive effects of mechanical force. Compared to unmodified bitumen, LEPWEO effectively retarded the aging of bitumen. And its carbonyl group, sulfoxide group, and microhardness change rates after long-term aging were reduced by 53.2 %, 90.0 % and 65.9 %, respectively. Moreover, LEPWEO had superior dispersibility and compatibility with bitumen. The contact angle of EP with bitumen was reduced from 30.4° to 12.7° after oil mill modification, which contributed to the uniform release of lightweight components. In this work, a porous biomass material with a lightweight composition is prepared by the oil milling process, which proposes a foundation for the application of retarded bitumen aging.