Abstract. Under the background of the development of computer technology and information technology, the smart home network has been gradually improved, surpassed the previous development, and gained new progress. The realization of smart home system needs network security technology as a guarantee. Although the smart home system has made progress, while for maintaining the harmony and coordination of the families' facilities and the residential environment, there are a lot of technical problems needed to be solved at present. For example, many safety standards need to be unified. This paper, from the realization of the domestic and international research situation of smart home, an overview of the network security technology, smart home network framework, and the existing smart home network security system to study on the application and research of network security technology in smart home, and then analyzes and draws the conclusion. In a word, to achieve the security of smart home system needs network security technology continuing to progress, so it also requires long-term efforts.