The utility model discloses a power electronic distribution transformer based on MMC, including MMC rectifier module, the DC who connects gradually DC isolator and DC the AC dc -to -ac converter, beDC connected to the input and the high voltage alternating current net of MMC rectifier module the output and the low pressure AC electric network of AC dc -to -ac converter are connected, DC doesthe DC isolator include a plurality of DC DC separant unit, a plurality of DC does the voltage input of DC separant unit hold in proper order the series connection between the DC output of MMC rectifier module, a plurality of DC is the low tension side parallel connection of DC separant unit at DC between the direct -current input end of AC dc -to -ac converter, DC DC separant unit includes by last bridge arm electric capacity, goes up the single -phase full bridge inverter that bridge arm IGBT, lower bridge arm electric capacity and lower bridge arm IGBT form including the sub - dc -to -ac converter, sub - intermediate frequency transformer and the sub - rectifier that connect gradually, sub - dc -to -ac converter, and single -phase full bridge inverter's input and hookup have voltage -dividing capacitor. The utility model provides a IGBT is small in quantity, and is with low costs, easily control, and the reliability is high.