In order to study the impact of lateral pressure coefficient on the stability of tunnel in jointed rock mass, the finite element software ABAQUS was used to establish the tunnel model in jointed rock mass, the impact of lateral pressure coefficient and joints dip angle on the stability of surrounding rock was analysed. The deformation law of surrounding rock, the distribution of stress and plastic zone, and the failure law of surrounding rock were investigated detailedly. The results show that, with the increase of lateral pressure coefficient, the vertical displacement, the maximum principal stress and the maximum equivalent plastic strain of surrounding rock decreased firstly, and then increased. When the dip angle of joint was the same, the safety coefficient firstly increased and then decreased with the increase of the lateral pressure coefficient. When the lateral pressure coefficient was the same, the safety coefficient firstly decreased and then increased with the increase of the dip angle of the joints. The conclusions can provide a useful reference for the design and construction of tunnel in jointed rock mass.