In order to study the effect of voids on the vertical displacement and maximum shear stress of the tunnel composite pavement, considering the effect of heavy load, ABAQUS was used to establish a composite tunnel pavement model, and the size of the void area on the vertical displacement and maximum shear stress was analyzed. The results show that the void area has a significant effect on the vertical displacement of the composite tunnel pavement, the difference between the center displacements of the two wheels and the maximum shear stress. As the void area increases, the vertical displacement first increases sharply and then the growth rate slows down. The displacement difference between the load centers of the two wheels increases firstly and then decreases.When the area of the void area is greater than 0.022 5 m2, the maximum shear stress moves from the top of the lower layer to the void area at the bottom of the lower layer. As the axle load increases, the void area becomes one displacement of the center road surface of the side wheel, the displacement difference of the center road surface of the two wheels, and the maximum value of the maximum shear stress increased.