Design of Rescue and Health Monitoring Bracelet for The Elderly Based on STM32

China has gradually entered an aging society, few studies have focused on smart wearable devices for the elderly. In this paper, the bracelet communicates with the APP on the smart phone through Bluetooth signal to achieve temperature and heart rate monitoring and one-button rescue function. STM32F103 is used as the MCU of bracelet ST188 is used for monitoring heart rate. MLX90614 is used to measure temperature. This system realizes body monitoring and one-button rescue function. It is proved that pressing the help button can call an emergency contact within two seconds and send the user's location and heart rate to the emergency contact. It plays an important role in buying valuable time for the effective treatment of sudden diseases of the elderly.