To control the toroidal field current efficiently and accurately, and to improve the experimental efficiency of the HL-2M tokamak, a simulation study on 300 MV·A six-phase motor generator (MG) feeding the toroidal field power supply (TFPS) is carried out. The topology of 300 MV·A six-phase MG feeding the TFPS is introduced, and its simulation model is established based on the equivalent processing analysis and the dynamic process of pulse discharge is simulated. The reliability and rationality of the simulation model are verified by comparing the simulation waveforms with the actual waveforms of the 300 MV·A six-phase MG feeding the TFPS of the HL-2A Tokamak. On this basis, the simulation of 300 MVA six-phase MG feeding the TFPS of HL-2M is carried out, and the corresponding excitation voltage control waveforms of the MG are obtained according to the different flat top values of the TF current, providing an important reference for the next stage high-parameter experimental control and research platform of advanced control strategy.