Extract of Pericarpium trichosanthis and Allium macrostemon, and preparation method thereof

The invention discloses a trichosanthes bark and allium macrostemon extract and a preparation method thereof. The composition is prepared by adopting the following steps: mixing trichosanthes bark with allium macrostemon in the weight proportion of 2:1 to 1:1; adding water or C1-3 ethanol with the concentration less than 50 percent for extraction; extracting an extracted solution by ion exchange resin and macroporous absorbent resin; extracting 50 to 90 weight portions of components from trichosanthes bark and the ion exchange resin of allium macrostemon; extracting 10 to 50 weight portions of components from the trichosanthes bark and macroporous resin of the allium macrostemon; mixing the two components; and obtaining the extract. The extract is applied to preparing medicines for treating diseases of cardiovascular system, and has determined curative efficacy; moreover, the extract reaches the goal of reducing dose without reducing medicine efficacy and has an extensive application prospect.