The invention relates to a heat-clearing, anti-inflammatory and analgesic herb extract, and specifically relates to a rauvolfia extract and its preparation method. And the preparation of the extract comprises the steps of: selecting rauvolfia, drying in the shade naturally and pulverizing; taking a proper amount of dried rauvolfia powder , adding 8-10 times amount of distilled water, and decocting in an appropriate container; filtering and condensing the filtrate; adding 95% ethanol, adjusting the ethanol concentration of the concentrated liquor to 70%, and allowing the liquor to stand overnight at a low temperature; filtering and removing the filter residue; freeze-drying the filtrate, thus obtaining freeze-dried powders as the product. The rauvolfia extract of the invention has an obvious effect in clearing heat, resisting inflammation and easing pain, and it can also be prepared into a heat-clearing, anti-inflammatory and analgesic medicine.