Abstract: In order to improve the design and optimization efficiency of the tractor diesel engine crankshaft, it introduced the finite element simulation analysis method into the design process of the crankshaft.Through the three-dimensional modeling and simulation analysis of the crankshaft, it carried out the optimal design of the crankshaft, which reduces the quality of the crankshaft and saves the raw materials of the crankshaft processing and manufacturing under the condition of meeting the limit yield force. Finally, through the finite element analysis method, it analyzed the resonance, strength and fatigue of the crankshaft. The results showed that the optimized crankshaft does not have resonance, and meets the requirements of strength and fatigue design, effectively improve the design level of the crankshaft.