Torque motor plays an important role in the process of converting electrical signal into mechanical output signal. The dynamic performance of torque motor was analyzed by means of finite element analysis method, and the calculation equations of magnetic flux in air gap and force generated on armature were obtained. Based on the analysis of the structure of the torque motor, the model of the reluctance in the air gap was obtained by using the physical characteristics of the air gap, and the magnetic flux in the air gap was calculated by using the reluctance in the air gap. Through the action of magnetic flux, the force produced on the armature was obtained, and then the balance equation of armature was established. Through the solid and finite element models of the feedback spring assembly, the stiffness model of the feedback spring and the rotational stiffness model of the injection pipe were constructed. A test device for feedback spring and jet pipe was designed by using thin steel wire arm and feedback spring, and the frequency response of feedback spring and jet pipe was tested through the device. According to the basic principle of electromagnetism and finite element method, the magnetic field distribution and nozzle deflection of torque motor under input current were analyzed. The experimental results show that the maximum deviations between the analysis results and the experimental results are 3.95% and 6.86%, respectively. The proposed method can be used to accurately analyze the dynamic performance of torque motor, and provides reference for further research on torque motor.