With the aging of the population, the demand for monitoring the health of the elderly is increasing. Smart health monitoring bracelets for the elderly have received widespread attention as a new type of health product. This design introduces an intelligent elderly health monitoring bracelet based on the STM32 microcontroller and implements the corresponding hardware and software systems. The smart bracelet can measure the elderly's heart rate, blood oxygen level, and number of steps, and display the results through a mobile app and OLED screen. It supports functions such as setting heart rate thresholds, time information timing, and heart rate alarms, making it easy to monitor the health of the elderly in a timely manner. The heart rate timing can be set manually through the button module, and the buzzer will automatically sound when exceeded. It also has features such as real-time detection and display. The experiment proves that this smart bracelet design is novel, practical, and has good market prospects and promotion value.