Abstract: A welding-rolling integrated composite forming method uses the low heat input wire filling welding method to cooperate with the optimization of the welding process, and at the same time the rolling device is used to roll the weld reinforcement area of the welded joint, realizing the precise control of the structure and properties of each area of the welded joint by using the plastic flow and deformation strengthening effect of the weld reinforcement of the welded joint during rolling process. The integrated composite forming device adjusts the distances between the welding mechanism, the rolling mechanism and the metal sheet to-be-welded and rolled by the coordination of each mechanism, and carries out synchronous rolling on the weld reinforcement of the welded joint.