The internal electromagnetic parameters of a surfacemounted permanent magnet vernier machine are complex and changeable, and MATLAB/Simulink cannot accurately reflect the actual electromagnetic performance of the machine under different operating conditions. The influence of cross coupling on the flux, inductance and torque of surface-mounted permanent magnet vernier machine is analyzed and calculated by applying the cross coupling theory to the model of flux, inductance and torque of surface-mounted permanent magnet vernier machine. The field-curcuit co-simulation model of a machine drive control system model was established based on ANSYS Maxwell, Simplorer and MATLAB/Simulink software. The driving performance of the machine is tested and compared with the simulation results of MATLAB/Simulink constant parameter simulation. The theoretical analysis and simulation results show that the calculation results of the co-simulation analysis method have higher accuracy because of the real-time change of the electromagnetic state inside the machine.