Method for preparing parthenolide originated from magnolia delavayi, magnolia liliiflora and magnolia denudate

The invention relates to a method for extracting parthenolide, in particular to a method for extracting parthenolide from root barks of magnolia delavayi, magnolia liliiflora and magnolia denudate. Parthenolide is obtained by using the root barks of magnolia delavayi, magnolia liliiflora and magnolia denudate as raw materials, grinding, extracting with polar organic solvent, properly extracting with organic solvent to obtain total lactone, separating total lactone by column chromatography, collecting necessary components, and crystallizing with proper solvent. The method for extracting parthenolide from root barks of magnolia delavayi, magnolia liliiflora and magnolia denudate provided by the invention is suitable for industrial production.