Design a fall reminder device for the elderly based on STM32 single-chip microcomputer，this device is composed of STM32F429BIT6 controller as the core，using buzzer and gyroscope as alarm device，through GPS(Global Positioning System)positioning and communication module to transmit location SMS to the user’s children．The gyroscope used in this device is a three-axis accelerometer，by comparing the measured tilt angle with the set threshold to determine whether the elderly have fall behavior，if there is a fall behavior，it is through STM32 to pull up the corresponding pin level，the buzzer accepts the command to start the alarm，while the GPS module captures the user’s real-time location and sends it to the ATK-IDM750C module，and uses the AT command to send a text message containing the detailed location of the elderly to the user’s children．This system helps to protect the personal safety of the elderly，and is safe and efficient，reliable data，convenient and accurate，greatly improving the rescue efficiency of the elderly after falling，and can effectively protect the personal safety of the elderly．