The invention relates to a high-voltage direct-current circuit breaker simulation method, and belongs to the technical field of direct-current power transmission. The simulation method comprises the following steps that each power module on a transfer branch of the direct-current circuit breaker is equivalent to a branch voltage source, an equivalent resistor and a branch stray inductor which aresequentially connected in series; and according to the number N of the power modules connected in series on the transfer branch, the transfer branch is equivalent to a total voltage source and a totalstray inductance which are connected in series, the total voltage source is the sum of the voltages of the N branch voltage sources and the N equivalent resistors, and the total stray inductance is the sum of the N branch stray inductances. According to the method, all power modules on the transfer branch are equivalent to the total voltage source and the total stray inductance which are connected in series, the equivalent circuit is simple, the breaking process of the high-voltage direct-current circuit breaker is accurately described on the premise that the simulation rate is not reduced, and the accuracy of circuit breaker simulation is improved.