Abstract: Aiming at current situation that five agricultural non-mechanical majors in College of Plant Science，Jilin University have difficulty in understanding machinery，and flowers have dried up in unmanned watering for a long time，an automatic watering system experimental device was developed.Soil moisture index was used as the switch for starting or stopping motor and water pump assembly and opening or closing the solenoid valve in experimental device to realize automatic watering.Effective application of this experimental device in experimental teaching of undergraduates has cultivated students' practical ability，problem-solving ability，innovative thinking ability，and scientific research consciousness of interdisciplinary.The application in real life could effectively solve problem that flowers raised in offices，courtyards and families would not be dried due to business trip，tourism，visiting relatives and friends，etc.At the same time，experimental device could also be applied to greenhouse，orchard，dry land，lawn and other places，to achieve precise irrigation，save time and effort，improve economic and social benefits.