Preparation method and detection method of bupleurum marginatum extract and construction method of specific chromatogram of bupleurum marginatum extract

The invention relates to the technical field of traditional Chinese medicine, in particular to a preparation method of a bupleurum marginatum extract, a construction method of a specific chromatogram and a detection method of rutin in the bupleurum marginatum extract.The preparation method comprises the steps that bupleurum marginatum decoction pieces are decocted twice to obtain decoction liquid, and the decoction liquid is filtered; the decoction is concentrated to obtain a concentrated solution, the concentrated solution is freeze-dried to obtain the bupleurum marginatum extract, the bupleurum marginatum extract is prepared from the bupleurum marginatum medicinal material, the extract yield of the bupleurum marginatum extract is 6-25%, the extract yield is high, and through an accelerated stability test, the extract yield of the bupleurum marginatum extract is higher than that of the bupleurum marginatum extract. The rutin content and the moisture content are relatively stable, and the specific chromatogra