Method for rapidly preparing forsythin from forsythia suspense leaves

The invention provides a method for rapidly preparing forsythin from forsythia suspense leaves and aims at solving the problems that forsythin can be easily decomposed, a preparation process is tedious and long time is consumed in the prior art. The method for rapidly preparing the forsythin from the forsythia suspense leaves comprises the following steps: preparing forsythia suspense leaf powder, firstly carrying out reflux extracting for 2-3 times by adopting absolute ethyl alcohol, concentrating filtrate into paste, then dissolving by adopting distilled water and filtering, concentrating obtained filtrate, refrigerating, filtering to obtain precipitate, dissolving the precipitate by adopting an ethyl alcohol solution, adding petroleum ether for extracting, and concentrating, drying and recrystallizing a solution at the lower layer for 2-4 times, thus the forsythin is obtained. Purity of the obtained forsythin is more than 98% when being detected by virtue of HPLC (high performance liquid chromatography). By adopting the method for rapidly preparing the forsythin from the forsythia suspense leaves, impurities can be greatly reduced, and great convenience is provided for subsequent purification operation; the petroleum ether is adopted for extracting, so that interference of chlorophyll is eliminated, and the purify of the forsythin is greatly increased; no column chromatography is used during separation, so that consumed time is greatly shortened, and manpower and time are saved for production.