The invention relates to a static direct-current charging simulation model for a modular multi-level converter, and a method thereof. In the simulation model, the anode of direct-current voltage is connected with one end of a smoothing reactor; the smoothing reactor, various sub-modules of an upper bridge arm, an upper bridge arm electric reactor, a lower bridge arm electric reactor and various sub-modules of a lower bridge arm are sequentially connected in series; the cathode of the last sub-module of the lower bridge arm is connected with the cathode of direct-current voltage; the anode of each sub-module is connected with the anode of a diode; after an equalizing resistor, an energy-obtaining power supply equalizing resistor and a capacitor are connected in parallel, one end is connected with the cathode of the diode; and the other end is connected with the cathode of the sub-module. The simulation model is established by practically measuring data, such as the equalizing resistance, the capacitance and the energy-obtaining power supply efficiency of various sub-modules and the total power of various control cards; according to the model, the voltage fluctuation conditions of various sub-modules when static direct-current charging of the converter is carried out can be simulated; the invention aims to provide the static direct-current charging simulation model for the converter; and thus, a related parameter design method and theoretical foundation are provided for starting flexible direct-current transmission engineering.