Taking the steering knuckle of a McPherson suspension as the research object, the finite element analysis method was used to verify whether it met the design requirements, and bench test was used to verify the reliability of the analysis results. The static analysis results of the steering knuckle under the fatigue test conditions were calculated by using finite element analysis method, and the fatigue life of the steering knuckle was calculated by combining with its material properties. In order to verify the analysis results, the hydraulic servo fatigue test system was used to carry out the steering knuckle bench endurance test. The results show that the results of finite element fatigue analysis are in good agreement with those of bench test, which indicates that the analysis method can be used as a reference for the design process of the steering knuckle, and the structure of the steering knuckle needs to be further improved.