Abstract: The low-voltage distribution network is the most core area of the application of electric power Internet of Things（EPIoT）. It is necessary to extend the smart low-voltage distribution network to EPIoT in nature. Present data acquisition and automation system for low-voltage distribution network needs to be developed into the cloud-edge node-edge device system architecture. As a core edge node, distribution transformer terminal unit（TTU） should have a quick iteration capability to realize the edged fusion and cloud-edge coordination of various old/new businesses. To meet such technique requirements, the key technologies such as container technology to support edge node are analyzed firstly. Secondly, the key implementation technologies to make TTU becoming a containerized edge node are proposed including hardware platform, software architecture, container deployment and interaction, container management, coordination between cloud and edge. Finally, by adding a new low-voltage circuit terminal unit（CTU）, the application scenario for TTU is designed and its necessity to become a containerized edge node is demonstrated.