Abstract: For the traditional continuous bending and roller leveling theory was created upon the repeated and continuous bending deformation of single metal, so when the theory was applied to the continuous bending and leveling of double metal composite plates, the precision is not high and the leveled flatness of double metal composite plates cannot be guaranteed. In order to perfect the theory of plate straightening force, the characteristics of double metal composite plate in leveling and bending deformation were analyzed, and hierarchical algorithm was proposed, and the model calculated data was compared with straightening experiment data. The results show that the method proposed can adopt different calculation methods and material models in different metal deformation layers, and is suitable to solve the roller leveling problems of double metal composite plates. The model calculated straightening force error is no more than 5.73%. The conclusions obtained show that using mathematical model based on hierarchical algorithm can achieve good results in the calculation of double metal composite plates.