Abstract: This paper designs a track type spraying device suitable for crop irrigation, fertilization and spraying in the laboratory environment, introduces the structural innovation of the spraying device compared with the traditional spraying mode, analyzes its advantages and application value, and looks forward to the development trend of agronomic spraying device in the future, in order to improve agricultural irrigation, fertilization and spraying in the experiment. The quality and efficiency of fertilization and spraying can promote the transformation and development from traditional agriculture to automatic agriculture.