The work aims to design a kind of station change mechanism to enable the heavy film packaging machine to receive and deliver the bags and packages in a more precise and stable manner. By analyzing the working principle of the mechanism, the related mathematical model was established. The SolidWorks software was applied to build the simplified mechanism model, and then the “tracking path” function in the Motion analysis was applied to design the theoretical contour curve of cam. Finally, the 3D physical model of the mechanism was built for the simulation analysis. There was no interference between the two swing arms in relative motion and their kinematic curve track was in a stable transition without sudden change. The station change mechanism has good kinetic characteristics and can meet the working requirements.