We hope to solve the problem of not missing the prime time for rescue when the elderly or patients with heart disease are sudden death or emergency event at home. Therefore, this work proposes an intelligent vital sign monitoring robot based on Robotic Operating System (ROS). The heart rate is measured and monitored through the millimeter wave module. At the same time, the infrared thermal imager and the cloud database are combined with image recognition to detect the temperature of a person’s head, and the measured head temperature and heart rate data are regularly uploaded in combination with blockchain technology to establish a complete vital signs database. When the robot detects an unexpected situation, it uses IFTTT service to send a Line message notification to notify the family or the rescue unit as soon as possible to avoid more unfortunate accidents.