The invention discloses a three-port energy control device based on a MMC structure, comprising: a coordinate controller, a three-port MMC converter, a control protection unit, an AC feeder line, anda DC bus. The coordinate controller is communicatively connected to one end of the control protection unit. The other end of the control protection unit is communicatively connected to the three-portMMC converter. One end of the three-port MMC converter is electrically connected to the AC feeder line, and the other end of the three-port MMC converter is electrically connected to the DC bus. The three-port energy control device, in view of the application trend of a future DC distribution network, improves the power flow controllability of an AC/DC hybrid distribution network, can realize apower quality management function, improves the power supply reliability of the distribution network and the scalability of a DC interface load.