A device to simulate rotor motion of liquid suspension multidegreeoffreedom spherical motor was proposed. By using the physical field of “rotating machinery, turbulence” and the finite element software, the calculation and analysis were carried out, including the numerical simulation of the turbulent flow field inside the rotor. Variables such as fluid velocity, pressure on the spherical surface of the rotor, deformation of the free liquid surface and power during the process were calculated at different depths and rotating speeds. At the same time, an experimental platform was built to simulate the dynamic rotor motion in liquid, and the power of the rotor was calculated by setting different rotational speeds. Finally, the differences between numerical simulation results and experimental results were analyzed, and the accuracy of numerical simulation was proved. The results show that the distribution of fluid velocity varies with the immersion depth of the spherical rotor, and the change of rotational speed affects the velocity change of the inner point of the flow field; the pressure at the top of the spherical rotor with different depths is greater than that at the bottom; the greater the rotational speed, the greater the pressure; obvious deformation of the free surface occurs at different depths and rotational speeds.The above research results provide reference for further research and analysis of fluid flow between stator and rotor of liquid suspended multidegreeoffreedom permanent magnet spherical motor.