Folium microcotis total flavone extract and preparation method and application thereof

The invention discloses a folium microcotis total flavone extract, and a preparation method and an application thereof. The extract contains 50 wt% to 95wt% of general flavone based on rutin, 3.5 wt% to 7.5 wt% of narcissoside in the total flavone extract, 0.5 wt% to 3.0 wt% of vitexin and 0.5 wt% to 3.0 wt% of isovitexin. The preparation method comprises the steps as follows: coarse extracting; taking one or more of water, methanol and ethanol as an extraction solvent for coarse extracting; refining: taking a macroporous resin or a polyamide or a silica gel as an adsorbent, ethanol or other organic solvents as an eluent for eluting, collecting the eluent, and decompressing and concentrating to obtain the folium microcotis total flavone extract. The folium microcotis total flavone extract provided by the invention contains 50 wt% to 95 wt% of the general flavone based on the rutin, and has the obvious effect of adjusting blood fat. The preparation method is simple and effective, thereby being suitable for industrial mass production and capable of preparing medicines for adjusting the blood fat.