The invention discloses a method for preparing lobetyolin,
atractylenolide III and
syringin from
codonopsis pilosula based on PRE-HPLC, and the method specifically comprises the following steps: (1) single
medicine extraction: taking a
codonopsis pilosula medicinal material, crushing, adding 12-15 times of
ethanol solution, carrying out ultrasonic extraction at 400-500W for 2-3 times, each time for 30-60min, after the extraction is finished, carrying out rough
filtration, and mixing filtrate to obtain a
codonopsis pilosula extracting solution; (2) concentrating and
drying: performing reduced-pressure vacuum concentration and
drying on the filtered extracting solution; (3) preparing and purifying: ultrasonically dissolving the dried extract, filtering through a 0.22 mu m microporous filter membrane, and preparing a
liquid phase; (4) fraction collection: respectively collecting lobetyolin,
atractylenolide III and
syringin fractions; and (5) concentrating and
drying: concentrating and drying the collected fractions under reduced pressure in vacuum. The method has the characteristics of convenience in operation, good reproducibility, short period, simultaneous preparation of three
monomer components and the like, and the prepared
monomer components have the characteristic of high purity.