In recent years, the research field of the Internet of Things has been expanding, and the interdisciplinary development has been realized. Aiming at the problem that wet and dry garbage is difficult to classify in real life, this paper designs a multi-functional trash can, based on the Internet of Things with STM32 microcontroller and sensors. In this paper, the hardware and software design of the system is mainly completed, and the modules include temperature sensor, humidity sensor, smoke sensor, infrared sensor, ultraviolet disinfection lamp, buzzer and OLED display screen, so as to realize the classification of dry and wet garbage, sterilization and disinfection, garbage loading and smoke alarm, which can reduce the growth of bacteria caused by the accumulation of domestic waste due to inaccurate classification. This design can solve the related events of dry and wet garbage classification, reduce the burden of garbage disposal, and promote the development of urban environmental protection.