The invention discloses a method for extracting
ecdysone from common
cyanotis roots and the
ecdysone thereof, belonging to the technical field of the extraction and the separation of effective components of plants. The method comprises the following steps of: decocting 0.5-1kg of common
cyanotis roots by 10L of water, or extracting by using 1-95 percent
methanol or
ethanol, and the ratio of the using amount of the
methanol or the
ethanol to the common
cyanotis roots is 5L-10L to 1kg; filtering, decompressing and concentrating to obtain liquid with the
relative density of 1.05-1.20; regulating a pH value to 6-10 by using alkali; then extracting by a mixed
solvent with normal
butanol and
ethyl acetate, wherein the ratio of the normal
butanol and the
ethyl acetate is 4:6-0.5:9.5; washing, decompressing and concentrating to obtain a
fluid extract with the
relative density of 1.2-1.3; adding 50-95 percent
methanol or
ethanol for dissolving and
dilution, passig through overhigh alkali type anion exchange resin, and eluting, concentrating and
drying in a decompressing way to obtain the
ecdysone. Compared with a conventional method, the method enhances the yield by 1.16-1.38 percent.