NOVELTY - The preparation method of lesser galangal rhizome extract involves: (a) taking 60-80 galangal powder, adding galangal powder to edible ethanol, then placing in power ultrasonic extraction machine and extracting to obtain extract; and (b) filtering extract obtained in step (a), collecting filtrate, adding 5-15 times galangal powder and edible ethanol to collected filtrate, then placing in power ultrasonic extraction machine, extracting to obtain extract, then repeating step for 1-3 times and combining obtained above filtrates.    USE - The method is useful for preparing lesser galangal rhizome extract, which is useful in preparation of health care product (claimed).    ADVANTAGE - The method prepares lesser galangal rhizome extract with high-efficiency in a safe and environmentally-friendly manner. The galangal rhizome extract has high content of flavonoid substances.    DETAILED DESCRIPTION - The preparation method of lesser galangal rhizome extract involves: (a) taking 60-80 galangal powder, adding galangal powder to edible ethanol in ratio of 1:5-15, then placing in power ultrasonic extraction machine at 0.3-5 kW and extracting for 20-80 minutes to obtain extract; (b) filtering extract obtained in step (a), collecting filtrate, adding 5-15 times galangal powder and edible ethanol to collected filtrate, then placing in power ultrasonic extraction machine at 0.3-5 kW, extracting for 20-80 minutes to obtain extract, then repeating step for 1-3 times and combining obtained above filtrates; (c) removing ethanol from filtrate obtained in step (2) to obtain composition; and (d) adding vegetable oil to composition obtained in step (c), carrying out extraction under the condition of vacuum degree of 0.05-0.09 MPa and taking oil phase, where the mass ratio of composition and vegetable oil is 1:0.5-2. INDEPENDENT CLAIMS are included for the following:    (1) lesser galangal rhizome extract prepared by the above method; and    (2) use of lesser galangal rhizome extract in preparation of health care product.