A new grabbing mechanism was designed for the mobile platform for handling of packed goods in the production line, and design optimization was conducted for the performance of the mechanism. Through the use of 3D modeling software and dynamic simulation of ADAMS software, parameterization design optimization was conducted for the grabbing mechanism, to obtain the movement rule and curve for the grabbing mechanism, and simulation analysis and parameterization optimization were performed for the key influencing factors. The optimization results showed that with every 0.2 s increase in the capture time, the contact force of goods and the clutch pawl reduced by about 10 N, and the contact force between the cargo and clutch fluctuated at around 75 N. Reasonable control of grabbing time, speed and stiffness coefficient of goods could effectively improve the stability of the grabbing mechanism. Through the simulation analysis, the relatively best contact force distribution curve which was applicable for rapid grabbing was obtained. In the prediction of of the motion law and design optimization of multibody mechanism, ADAMS software could provide powerful evidence, and has reference value for design improvement in the future.