In order to solve the problem that the old people and children are not easy to distinguish the garbage classification method,this paper presents a set of automatic reminder and inquiry device based on human body induction and voice prompt. The system ismainly composed of STM32 mcu core control system, LD3320 speech recognition module, human body induction module, speech broadcast module and TFT display screen. The automatic garbage classification prompt is realized by integrating speech word baseand matching algorithm in the system, and the acousto-optic prompt is set at the corresponding garbage input port. Through the garbage entry test, the functions of garbage classification and automatic reminder are achieved.