A numerical simulation model for quantitatively analyzing the sealing performance of a rubber material high-speed rotating lip seal was established by combining its structure and actual application conditions,using methods such as equation discretization calculation.Based on the established model,the coupling relationship between multiple physical processes such as interface fluid mechanics,macroscopic solid mechanics,surface roughness peak microscopic contact mechanics,and lip friction heat generation under the actual service state of the seal was analyzed,and the accuracy of the numerical simulation model was verified and improved through experiments.Based on the numerical simulation model,the change law of the key parameters of the sealing performance,such as the contact pressure distribution,the temperature of the lip,the friction moment and the leakage rate,with the rotating speed were studied.The results show that,when the friction heat generation is considered under the condition of high rotating speed,the radial force of oil seal decreases,the contact width increases and the friction torque decreases,which indicates that the friction heat has a great influence on the sealing performance of oil seal.