The invention relates to a sawtooth carrier PWM (SC-SPWM) method used for asymmetrical six-phase two-level converters and having the common-mode voltage suppression capability and belongs to the technical field of power electronics. The method is characterized by comprising the steps of first calculating modulation waves for each phase; setting an initial value of a triangular carrier counter of each phase to implement the same phase of the zigzag carrier of each three-phase group, and causing two groups of carriers to be in mirror symmetry within a carrier cycle; causing k phase modulation wave and the triangle carrier to undergo PWM, and obtaining a bridge arm power switch tube control signal step(k) of the phase; generating a driving signal of a power switch tube according to the step (k) signal, to suppress common-mode voltages of the asymmetric six-phase two-level converters. A conventional SPWM method and the SC-SPWM method are applied respectively to simulate and experiment theasymmetrical six-phase two-level converters, and the comparative analysis shows that the modulation method has a better CMV suppression effect.