Taking the main driving single-lip seal ring of shield machine under typical working conditions as the research object,the material parameters of Yeoh third-order model were determined by using the stress-strain curve obtained from the uniaxial tensile test of nitrile rubber material.The two-dimensional axisymmetric finite element model of single-lip seal ring was established,and the effects of medium pressure,pressure difference,friction coefficient and temperature on its sealing performance were simulated was studied.The results show that the medium pressure mainly affects the maximum contact stress,and the maximum contact stress increases linearly with the increase of the medium pressure.The maximum contact stress and contact length are mainly affected by medium pressure difference,and with the increase of medium pressure difference,the maximum contact stress first increases linearly and then basically remains unchanged,while the contact length increases nonlinearly.The influence of temperature change on sealing performance can be ignored.Under the conditions considered,the maximum contact pressure between the lip and the rigid body of the single-lip seal ring is always greater than the medium force,and the sealing performance is good.