The invention relates to a capacitor voltage balance method based on a hybrid double half-bridge and parallel full bridge MMC sub module. The method is characterized in that the common nearest level approximation strategy is taken as basis, sub module voltage equalization control strategies in valve sections and among the valve sections are designed, and the two are integrated. The method is advantaged in that dependence on capacitor voltage measurement and ordering is avoided, capacitor voltage monitoring timelines and controller operation speed demands are substantially reduced, not only canflexible operation characteristics be inherited, but also control logics are substantially simplified, requirements for sensors are reduced, relatively good engineering application prospects are realized, and the hybrid MMC is facilitated to develop to the higher voltage grade and larger capacity. The method has an important reference role for researchers of voltage equalization control and half-bridge and full bridge hybrid sub module topology researches.