The present invention relates to a system for a cyber boundary wall using a software defined networks (SDN)-based zero wall pad and an operation method thereof, the system comprising: a wall pad in which an operating system (OS) has been removed and which provides a user interface for controlling Internet of Things of a corresponding household; a household switch that is connected to the Internet of Things and a smart metering network, performs a router function of the wall pad, and controls the Internet of Things on the basis of control information for the Internet of Things, to be input via the wall pad; a server that receives, via the household switch, data about the Internet of Things of the corresponding household, generates a virtual screen corresponding to the user interface, on the basis of the data about the Internet of Things of the corresponding household, and then provides the generated virtual screen to the wall pad; and a virtual private network (VPN) server that interworks with the household switch and the server.