The strength of carrier shaft, the clearance of blade and the dynamic characteristics have great influence on the crushing effect of the plastic crusher. In order to ensure the reliability of SG-90200 large crusher, avoid the fracture of the carrier shaft, reduce the vibration of the crusher and improve the crushing efficiency, the dangerous section of the carrier shaft was checked and the results met the design requirements. The optimum parameters of blade clearance, moving tool thickness and blade height of the carrier shaft were obtained by combining the orthogonal test and prototype verification. ANSYS Workbench was used to analyze the dynamics and statics of the carrier shaft. The dynamic characteristics of the optimal carrier shaft structure were analyzed by the dynamic balancing machine HQ-500 and the dynamic signal analyzer COCO-80，and the results were compared with the finite element analysis results. The results show that the frequency error is within 5%. The dynamic equilibrium degree of the SG-90200 large crusher carrier shaft measured by HQ-500 dynamic balancing machine is over 95%. The static analysis results of SG-90200 and SG-4390 large crusher are consistent. However, the SG-90200 large crusher carrier shaft has the best crushing efficiency and energy consumption. Dynamic analysis of ADAMS shows that with the increase of crushing load, the impact on carrier shaft is increased.