This unit mainly consists of a dynamic extraction tank, an evaporative concentrator, and process pipelines. It integrates dynamic thermal reflux extraction, vacuum concentration, and solvent recovery, and can continuously and synchronously extract and concentrate in a closed state. The solvent vapor generated during concentration is condensed and refluxed to the extraction tank, and can be reheated by secondary steam to perform thermal reflux dynamic extraction. It is suitable for water and organic solvents in industries such as traditional Chinese medicine, biology, food, and light industry at room temperature and around 60 ℃ for low-temperature extraction. It has the advantages of low investment, high efficiency, and obvious energy saving.