<p>The asymmetric phenomenon is universally present in the composite plate rolling process, which will cause the plate bending. The bending of the plate will affect the subsequent use and the formability of the next pass, resulting in poor stability of industrial production. Therefore, the curvature model of snake rolling of composite plate is established in this paper. Snake rolling adds reverse bending on the basis of asynchronous rolling, which increases the length of the deformation zone and further regulates the bending curvature of the plate. The nonlinear boundary function, velocity field, and strain rate field are established according to the deformation characteristics. The bending curvature after snake rolling in different deformation regions and the variation of curvature with different offsets and roll diameter ratios are analyzed. Meanwhile, the parameter matching mechanism for reducing the curvature of the plate and promoting the deformation coordination of dissimilar metals is obtained, combined with finite element simulation and experimental verification. The variation of friction power caused by the asymmetry of the neutral point position is analyzed according to the distribution of different deformation zones. In this paper, the node velocity on the cross shear zone and the reverse bending zone of the composite plate is creatively established. The results show that the flow velocity difference in the reverse bending zone of different layers is smaller than that in the cross shear zone, which is more conducive to the flatness. The experimental results of snake rolling show that the average relative deviation of the curvature theoretical model is 5.44%, which verifies the accuracy of the established curvature theoretical model and is of great significance for the optimization and prediction of process parameters.</p>