Objective: This study aimed to improve the accuracy and feeding speed of the cap arranging unit. Methods: Using SolidWorks to build a virtual model and manufacture a real object, and the kinematic simulation of bottle cap and capping machine was carried out in Adams. Moreover, the results of different speeds were compared and analyzed. ANSYS Workbench was used to carry out engineering simulation of the device components and obtain their natural frequency and vibration mode, and the structural performance was optimized. Results: The cap arranging unit had the minimum damage to the caps at the optimum speed. The optimal speed of the designed new cap sorter mechanism was 15 r/min, and the average number of caps unscrambling was 402 pieces/min. Conclusion: The operation of the new cap sorter mechanism exceeds the scheduled workload stably, which meets the operation requirements of the cap sorter mechanism.