The performance of the shield machine main drive lip seal directly affects the construction efficiency of the whole shield machine.The shield machine main drive lip seal sealing medium is grease,and the lip temperature can reach 50 ℃ to 60 ℃ during operation.To better predict the sealing performance of the lip seal,a shield machine lip seal fluid-solid-thermal coupling simulation model was established considering the rheological characteristics of grease on flow field analysis and the influence of lip temperature on sealing materials.The flow separation method was used to derive the two-dimensional Reynolds equation for the grease.The Hertzian contact model was used to calculate asperity contact pressure,and the thermal coupling analysis was carried out by finite element software to achieve quantitative prediction of the lip seal temperature field and key performance parameters such as friction torque and leakage rate.The results show that the maximum static contact pressure of the lip seal decreases,the contact width increases and the friction moment decreases after considering the temperature field.Thus,the temperature has a greater influence on the stress-strain state and sealing performance of the lip seal,which is a certain guidance for the design of the shield machine main drive lip seal.