NOVELTY - Separating ursolic acid from plantain herb, involves: extracting crushed plantain herb by using lower alcohol or its solution, recycling solvent, and obtaining extract; extracting the extract by middle polar solvent, recycling and obtaining extracting matter; degreasing the extracting matter by low polar solvent and dissolving into lower alcohol; decoloring degreased matter by activated carbon, recycling solvent, and obtaining white ursolic acid crude product; and recrystallizing the crude product by lower alcohol or its solution, and/or ethyl acetate, obtaining ursolic acid crystal.    USE - For separating ursolic acid from plantain herb (claimed). The ursolic acid is useful for curing liver fibrosis, muscle atrophy, anti-hypertension, atherosclerosis and anti-oxidation, for inducing differentiation and for preventing and treating cancer and HIV.    ADVANTAGE - The method is simple and practicable method; and produces ursolic acid in high purity and low cost. Compared with other plant raw material, the present method utilizes widely distributed raw material and is also easy to culture and grow quickly, thus is cost-effective raw material. Also the chemical raw material utilized in the present method is easy to obtain and can be recycled and used, and is eco-friendly. The present method does not use column chromatography technology, and is directly performed by extracting, decoloring and crystallizing, so the technique is simple, the device is simple, and is suitable for mass production.    DETAILED DESCRIPTION - Separating ursolic acid from plantain herb, involves: taking crushed plantain herb, adding lower alcohol or its solution according to liquid-solid ratio of 4/1 to 20/1 ml/g, and volume fraction concentration of 50-100%, heating to reflux extraction at 20-90 degrees C or ultrasonic wave extracting for 1-3 times by ultrasonic wave with power of 100-1000 W or microwave with power of 10-1000 W, each time for 0.1-2 hours, stirring at 0-2000 revolutions per minute (rpm), combining extract solution, recycling solution at normal or depressurized pressure, and obtaining extract; taking the extract, adding middle polar solvent according to liquid-solid ratio of 10/1-100/1 mg/g, heating to reflux extraction at 20-70 degrees C, or ultrasonic wave extracting with power of 100-1000 w or microwave with power of 100-1000 w for 1-3 times, each time for 0.1-2 hours, stirring at 0-2000 rpm, or dispersing extract into water, extracting by the middle polar solvent for 1-3 times, and volume fraction of water phase to organic phase of 1/9:9/1, combining extract liquid or organic extract solution, recycling solvent at normal pressure or depressurized pressure, obtaining middle polar solvent extract; taking the middle polar solvent extract, adding low polar solvent according to liquid-solid ratio of 10/1-100/1 ml/g, heating to reflux extraction at 20-90 degrees C, or ultrasonic wave extracting with power of 100-1000 w or microwave with power of 100-1000 w for 1-3 times, each time for 0.1-2 hours, stirring at 0-2000 rpm, filtering or centrifuging, obtaining degreased middle polar solvent extract; adding into lower alcohol or its solution according to liquid-solid ratio of 20/1-200/1 ml/g, and volume fraction of 50-100%, dissolving the degreased middle polar solvent extract, adding activated carbon according to extract mass of 1/10-5/1 at 20-90 degrees C, heating to reflux extraction or ultrasonic wave extracting with power of 100-1000 w or microwave with power of 100-1000 w for 1-5 times, each time for 0.1-2 hours, stirring at 0-2000 rpm, filtering or centrifuging, recycling solvent at normal pressure or depressurized pressure, obtaining ursolic acid crude product; and taking ursolic acid crude product, adding lower alcohol according to liquid-solid ratio of 20/1-300/1 ml/g, and volume fraction of 50-100%, ethyl acetate or mixture of ethyl acetate and lower alcohol, at volume ratio of 1/9-9/1, crystallizing or recrystallizing, filtering or centrifuging, and obtaining ursolic acid crystal.