Abstract: The present invention relates to a device for controlling power distribution to distribution lines in a distribution technology field. More particularly, the present invention relates an improved device for controlling power distribution to distribution lines for reinforcing security of Internet Of Things (IoT) by coupling a security chip, an security chip, an IoT security terminal, an IoT key distribution server, and a security application with each other upon smart metering using the IoT as a part of a smart grid to prevent unauthorized access and for efficiently controlling power distribution to distribution lines using metering information according to smart metering.