Abstract: With the continuous improvement of equipment efficiency and reliability requirements in modern industry, the optimal design of rotary crusher liner has become the key element to improve the performance of mechanical equipment. This paper focuses on the optimization design of the rotary crusher liner, aiming to improve its working efficiency and service life through the optimization of the liner profile and material selection. Firstly, the working mechanism and failure mode of the rotary crusher liner are analyzed, based on which a complete set of optimal design scheme is proposed. The finite element analysis method is used to simulate and verify the design scheme, and the optimization effect is evaluated through the actual working condition test. The results show that the wear resistance, impact resistance and working stability of the optimized rotary crusher liners have been significantly improved. The research results provide theoretical basis and practical guidance for the engineering application of rotary crusher liner.