Objective The purpose of the research aims to explore the influence of hook deflection angle and hook inclination angle on the mechanical properties of the hook of soft tissue suture passer, and to provide theoretical basis for the optimal design of soft tissue suture passer. Methods Taking the end face (end face 1) far away from the tip of the needle as the research object, a mathematical model is established with the torque value as the dependent variable and the hook deflection angle and inclination angle as the independent variable. The torque value is solved by the mathematical model when the deflection angle and inclination angle are 0°, 10°, 20° and 30°. Based on the finite element analysis method, 16 kinds of hook three-dimensional geometric models with deflection angle and inclination angle of 0°, 10°, 20° and 30° are established by SolidWorks software. The stress analysis is carried out by ANSYS Workbench software. Under the same puncture force, the maximum equivalent (von-Mises) stress of each hook and the reaction moment of end face far away from the tip of the needle are calculated. Results The results of theoretical analysis and numerical simulation show that the reaction moment of end face 1 increases with the increase of deflection angle and decreases with the decrease of inclination angle. The hook with deflection angle of 0° and inclination angle of 30° had minimum reaction moment (25.23N?mm). The results of finite element analysis show, when the deflection angle is 0°, the maximum equivalent stress of the hook does not change as the change of the inclination angle of the hook, and it is the minimum value of 62.65MPa. Conclusions The maximum equivalent stress of hook and the reaction moment of end face 1 increase with the increase of deflection angle and decrease with the decrease of inclination angle. The established mathematical model can accurately explain the relationship between the moment at the end face of the hook and the deflection angle and inclination angle of the hook.