The invention relates to the field of
medicine preparation, in particular to a
catalpol preparation method, which solves the low conversion rate, low yield and low product quality problems in the preparation of
catalpol in the prior art and adopts a process that comprises: washing raw materials,
slicing and performing enzymolysis; adding
ethanol, performing homogenate extraction for 2 or more times at normal temperature in a homogenate extraction device; mixing homogenate, filtering out
slag, collecting filtrate, concentrating the filtrate under reduced pressure, adding water to dilute thick extract, adding the diluted extract into
macroporous resin, eluting, and concentrating the eluent under reduced pressure to obtain extract; and adding sample mixing
silica gel, uniformly stirring, passing the stirred product through a
silica gel column, concentrating eluent under reduced pressure, and recrystallizing in
methanol to obtain pure
catalpol. The method of the invention greatly improves production efficiency and conversion rate, promotes more effective material in the
raw material to be converted into catalpol, further improves product quality, improves product purity and is suitable for industrial production.