This work aimed to study the effects of the flexible long arm on packaging mechanical CAM system, in order to provide an intuitive way to test and verify whether the design of the CAM system could meet the requirements. Taking the CAM system widely used in candy packaging machine as the research object, after setting up the 3D model by SolidWorks, the MNF of the flexible body by Ansys, and the rigid-flexible coupling analysis model by combining these two, simulation of the system was conducted using ADAMS to obtain the corresponding actual displacement output curves. Considering the two swing arms as the flexible body, the distance between the upper and lower punch synchronization periods showed a certain fluctuation, and the biggest change was 2~3 mm. The effect of the flexible body on the actuator was not obvious, and the effect could be eased by setting some pieces of the rubber gasket on the actuator to avoid mincing of candy during holding.