Method for extracting and separating chlorogenic acid from senecio cannabifolius less

The invention belongs to the field of natural organic chemistry and relates to a method for extracting and separating chlorogenic acid from senecio cannabifolius less. The method has the advantages that 1, the method adopts an ultrasonic assisted extraction technology to accelerate the entrance of a target component into the solvent and promote extraction so that energy saving, high extraction efficiency, wide adaptability and low cost are realized and the influence caused by a high temperature on active ingredients is avoided, 2, a series of purification processes such as alcohol precipitation, multiple extraction processes, activated carbon-based impurity removal and chromatography column purification are adopted, compared with the traditional extraction method, the method greatly improves the extraction efficiency, increases the purity of the extract and prevents the heavy metal lead pollution caused by alcohol extraction and lead precipitation, and the prepared chlorogenic acid can be widely used in the f