NOVELTY - Extracting lappaconitine comprises pre-treating traditional Chinese medicinal materials, extracting obtained Aconitum sinomontanum powder with ethanol, ultrasonically extracting mixture, filtering mixture, decompressing and concentrating filtrate, adding hydrochloric acid and filtering mixture, extracting the acid water solution by petroleum ether, extracting acid water solution with ethyl acetate, condensing the solution, cooling at room temperature and dissolving lappaconitine extract in ethyl alcohol, separating out crystal, filtering crystal, washing and crystallizing.    USE - The method is useful for extracting lappaconitine.    ADVANTAGE - The method is simple, eco-friendly and cost-effective for extracting lappaconitine with high yield and without pollution, in a short period. The toxic solvents are not utilized in the process such as chloroform and phenyl.    DETAILED DESCRIPTION - Extracting lappaconitine using ultrasonic-assisted method comprises (a) pre-treating traditional Chinese medicinal materials for high aconite root with 60-80 of mesh sieve to obtain Aconitum sinomontanum powder, (b) extracting the powder with 95 vol.% of ethanol according to a ratio of 1 g:10-20 ml, at a power of 150-250 W and a temperature of 40-60 degrees C for 12-36 hours, ultrasonically extracting the mixture at 30-50 degrees C, filtering the mixture to obtain the filtrate, decompressing and concentrating the filtrate until there is no ethanol, cooling to room temperature, adding hydrochloric acid to dissolve with a density of 1-1.30 and then standing and filtering the mixture to obtain acid water solution, (c) extracting the acid water solution by petroleum ether, adjusting the pH value of obtained raffinate to alkali solution with pH value of 9-10 by concentrated ammonia water, extracting acid water solution with ethyl acetate, condensing obtained solution without ethyl acetate, cooling at room temperature to obtain lappaconitine extract, and (d) dissolving lappaconitine extract in absolute ethyl alcohol and then standing, separating out the crystal, filtering the crystal, washing and crystallizing the crystal using pre-cooled absolute ethyl alcohol.    DESCRIPTION OF DRAWING(S) - The figure shows a flow chart of a method of extracting lappaconitine (Drawing includes non-English language text).