The sustainable standard of rotary shaft lip seal was investigated and determined.According to the specific structure and production process of rotary shaft lip seal,by using a combination of quantitative and qualitative methods,the environmental,social and economic sustainable indexes such as energy consumption,carbon emission,per unit production time,cost at each stage of rotary shaft lip seal life cycle were calculated and analyzed based on a life-cycle assessment(LCA) method.The sustainable improvement strategy of rotary shaft lip seal was determined,which are that environmental sustainability focuses on reducing energy consumption during the use stage,social sustainability focuses on innovation in production processes,and economic sustainability focuses on extending lifespan design.The sustainable design of rotary shaft lip seal was implemented from two aspects of prolonging service life and optimizing the friction state during the operation.The influences such as macro section shape and size,the roughness and surface texture of microscopic appearance,seal lip material on the sustainable performance of rotary shaft lip seal were analyzed.The results show that thin lip and surface micro texture as well as wear-resistant materials play positive roles in reducing energy consumption and carbon emissions of rotary shaft lip seal.The research results are of great significance for improving the sustainability of rotary shaft lip seal.