The invention discloses a hybrid cascade multi-level transverter capacitance-voltage balance method and a system. The hybrid cascade multi-level transverter capacitance-voltage balance method comprises steps of taking each single bridge arm as a study object in the Hybrid cascade multi-level transverter, performing sorting in a preset order on all power modules in the single bridge arm to obtain the capacitance voltage sorting result, adopting a nearby rounding principle on a reference wave of the single bridge arm to obtain the quantity M of the power modules needed to be invested by the single bridge arm, and reasonably arranging triggering pulse of a full-bridge power module and a half-bridge power module in the single bridge arm according to the capacitance-voltage sorting, the quantity M of the power modules needed to be invested by the single bridge arm and the current direction in the bridge arm. The invention realizes the balance of the capacitance and voltage of the hybrid cascade multi-level transverter.