NOVELTY - The preparation method of radix scutellariae extract involves: (1) taking Scutellaria baicalensis and crushing to obtain Scutellaria baicalensis powder; and (2) adding Scutellaria baicalensis powder obtained in step (1) to extraction vessel according to solid-liquid ratio of 1:5-15, performing 2-3 times reflux extraction with weak acid and ethanol as extraction solvent, carrying out extraction at 60-90 degrees C for 1-2 hours, filtering to obtain filtrates and combining obtained filtrates to obtain Scutellaria baicalensis extracting solution.    USE - The method is useful for preparing radix scutellariae extract (claimed).    ADVANTAGE - The method enables simple preparation of radix scutellariae extract with high purity, yield and rate in an environmentally-friendly manner.    DETAILED DESCRIPTION - The preparation method of radix scutellariae extract involves: (1) taking Scutellaria baicalensis and crushing to obtain Scutellaria baicalensis powder; (2) adding Scutellaria baicalensis powder obtained in step (1) to extraction vessel according to solid-liquid ratio of 1:5-15, performing 2-3 times reflux extraction with weak acid and ethanol as extraction solvent, carrying out extraction at 60-90 degrees C for 1-2 hours, filtering to obtain filtrates and combining obtained filtrates to obtain Scutellaria baicalensis extracting solution, where the ethanol has concentration of 50-95%; (3) adding hydrochloric acid to Scutellaria baicalensis extracting solution obtained in step (2) at 70-90 degrees C for 0.5-1 hour to adjust the pH-value to 1-2, leaving reaction mixture at room temperature for 3-12 hours, separating baicalin from acidic ethanol supernatant by centrifugation, washing precipitate with water and different concentrations of ethanol until the pH-value is neutral, drying Scutellaria baicalensis extracting solution to give crude product, recovering acid ethanol supernatant and using acid ethanol supernatant as extraction solvent in step (2); and (4) dissolving crude product obtained in step (3) in water and sample macroporous resin, washing sample macroporous resin with water and 50% ethanol, eluting with 95% ethanol, collecting 50% ethanol fractions, concentrating and drying.