Abstract: We combine the principle of ultrasonic fragmentation and the technology of extraction of active principle from plant to design an extraction pot, with which external heating cycle, ultrasonic fragmentation and electronic mixing device will take effect coordinately. Based on the existing devices resources, we have made a set of ultrasonic assisted phyto-extraction device system, which is applicable to undergraduate education and experimental research. This device system consists of heating device, extracting device and controlling device. The system has been applied to the experiment of tea polyphenols extraction in tea, and has achieved good results, which has a certain practical value.