With the rapid development of automobiles, people’s demand for high-speed cars is constantly increasing. For a certain rotor pump, this article uses 3D modeling software to establish a solid model of the rotor pump and conduct finite element analysis. According to the original data provided by the manufacturer, the torque of the internal gear and external gear ring of the gear rotor pump during calibration working conditions is calculated to be 12250 N·mm. Then, the finite element simulation was conducted using ANSYS software, including analyzing its structural strength and stiffness, and finite element modal analysis. The simulated contact stress value was 127.63 MPa. The natural frequency and modal vibration of the gear rotor pump were obtained. The research results provide a reference basis for the optimization design of subsequent gear rotor pump.