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With the rapid development of digital technology, home security tends to be networked and intelligent. In order to meet people"s requirements for the safety of living environment, the home security system is designed, which has function of environmental monitoring, fire and theft prevention and alarm. An Android smart phone is used as a monitoring terminal, and a home PC is used as a server. The STC89C52 microcontroller is a core processor of sensor acquisition nodes. The system integrates WIFI LAN, 3/4G operator network and NRF sensor network to realize real-time video monitoring function. Users can watch remote monitoring video and make emergency treatment in the Android phone client in real time. The combined test of software and hardware shows that the system is stable and reliable, easy to extend and has application value.