It is especially important for us to detect heart rate due to the relatively high incidence of coronary heart disease in China. Detecting body temperature during Covid-19 is essential. Older heart rate and temperature detectors are commonly used in hospitals due to their high cost of construction. Therefore, it is of great practical importance to design a small heart rate and temperature detection device in this paper. We use STM32 microcontroller and sensors to implement heart rate and body temperature detection so that heart rate and body temperature can be detected in time.