At present, most people have poor sleep quality, difficulty in falling asleep and insomnia，in order to alleviate this phenomenon more effectively,this paper designs a sleep quality detection device based on STM32 controller.The device can use LCD touch screen, real-time display time, temperature and humidity, noise, carbon dioxide concentration and other information of the environment,at the same time, users can independently define factors that affect sleep quality.It can communicate with curtains, air conditioners, stereos and refrigerators at home,they work together to create a sleeping environment that minimizes the impact of external factors.The device is easy to operate, stable and reliable. It provides good sleep service for users and creates a suitable environment.