An unmanned fermentation beverage vending machine based on STM32 microcontroller is designed, including feeding unit, mixing unit, temperature control unit and filling unit. Fully automatic realization of the production and preservation of fermented milk tea, after the completion of the payment of automatic filling out of the cup, can be used for the production of fermented milk tea on site With sales, and the ability to self-clean, reduce human input. The design mainly realizes the following functions: The index of fermented milk tea was collected to realize the control of fermentation tank. The functions of cleaning, sterilization and refrigeration are added to the fermentation tank to achieve multiple functions. The integrated filling mechanism can fill fermented milk tea into paper cups. The controller uses STMicroelectronics STM32 series microcontroller. The serial port is used to communicate between each module, and the main controller issues control instructions to each module to realize various functions. Through experiments and processing production, the equipment can be fermented milk tea production and filling, can be a fermented milk tea 25L, each cup filling time in about half a minute, equipment to meet the design requirements.