The invention discloses a modular multilevel converter topology reconstruction type submodule and a modeling method thereof. If an independent physical or digital simulation platform is established for each model, the problems that resources are waste, and the workload is high are obviously generated. In order to solve the problems, the Modular multilevel converter topology reconstruction type submodule comprises a positive electrode end, a negative electrode end, six IGBTs, anti-parallel diodes of the IGBTs, five switches and two capacitors; and each topology reconstruction type submodule forms a bridge arm of a modular multilevel converter by cascading the positive electrode end with the negative electrode end. According to the modular multilevel converter topology reconstruction type submodule, multiple MMC submodule topologies can be established and integrated, and the effect that multiple MMC topologies are studied only through a unified simulation model is achieved; and the simulation modeling cycle can be shortened, resources can be saved, and the construction cost can be reduced.