NOVELTY - Fibrauretine is extracted by taking berberine, adding sodium hydroxide to adjust pH, filtering, adding filtrate with sodium hydroxide to adjust pH, salting, filtering, concentrating filtrate to adjust pH, standing overnight to obtain jatrorrhizine deposit, adding with water, and dimethyl sulfate, stirring, adding jatrorrhizine precipitate to sodium hydroxide solution, heating, stirring, adjusting pH, cooling, filtering, taking filter cake, adding ethanol, heating to dissolve, adding hydrochloric acid to adjust pH, standing, filtering, washing with ethanol, and drying.    USE - Extraction of fibrauretine for treating gynecological inflammation, bacillary dysentery, enteritis, respiratory, and urinary tract infection, surgical infection, and conjunctivitis.    ADVANTAGE - The method uses berberine production waste, is simple, easy to operate, low cost, and suitable for industrial production.    DETAILED DESCRIPTION - Extraction of fibrauretine which involves taking berberine, adding sodium hydroxide to adjust pH to 8-9, filtering, taking filtrate, adding with sodium hydroxide to adjust pH to 12 plus minus 0.5 to obtain system A, adding system A with 15% sodium chloride, salting for 24 hours, filtering, concentrating filtrate with 2/3 water to adjust pH to 2-3, standing overnight to obtain jatrorrhizine deposit, taking jatrorrhizine deposit, adding with water 10 times amount of deposit, and dimethyl sulfate 3.3 times amount of deposit, uniformly stirring, slowly adding jatrorrhizine precipitate to 4.5 times amount of 30% sodium hydroxide solution to obtain system B, heating system B in water bath heating device at 30-35 degrees C, stirring for 20 minutes, raising temperature to 40-45 degrees C, stirring for 20 minutes, raising temperature to 55-60 degrees C, stirring for 20 minutes, adjusting pH of solution to 2-3 to obtain system C, cooling, filtering, taking filter cake, adding ethanol 10 times amount of filter cake, heating to dissolve, adding hydrochloric acid to adjust pH to 2-3 to obtain system D, standing overnight, filtering, washing precipitate with ethanol, and drying.