To effectively improve the health level of the elderly, a home elderly health monitoring system based on IoT is designed. The system is based on the STM32 microcontroller and uses multiple sensors to collect real-time physiological parameters such as body temperature, heart rate, blood oxygen, and fall status of the elderly. Through comprehensive data analysis and processing, it effectively judges the health status of the elderly and has functions such as local display of collected data, voice broadcast of abnormal data, and SMS alarm; And it can use WIFI communication technology to achieve remote data transmission, and complete data storage, query, and networked monitoring based on the Alibaba Cloud platform. The test results show that the system can effectively meet the real-time monitoring and remote management needs of the health status of the elderly, with the characteristics of low cost, easy operation, and strong real-time performance, providing comprehensive health management and safety guarantee for the elderly.