This article explores the application of smart home early warning systems based on Internet of Things technology in improving home security and life convenience. The system uses Internet of Things technology and combines microcontroller technology, sensor technology and wireless network technology to realize home security automation and real-time monitoring. It designs a network communication solution for a smart home early warning system based on STM32, including hierarchical structure and functional structure. The designed system has the advantages of reliable communication, strong real-time performance, low power consumption and low cost, meets market demand, improves home security, and contributes to the realization of an intelligent living environment.