NOVELTY - An artemisinin is extracted by providing dried Artemisia leaf, putting into refluxing ultrasonic oscillator, adding petroleum ether, and boiling at 60-90 degrees C; and performing ultrasonic irradiation at frequency of 25-35 kHz, power of 1200-1500 W, adding petroleum ether, heating, refluxing and extracting for 3-5 times for 30 minutes at 60-70 degrees C and filtering to obtain dregs containing artemisinin.    USE - Method for the extraction of artemisinin (claimed).    ADVANTAGE - The method improves extraction efficiency, increases total yield, shortens extracting time, and reduces solvent consumption.    DETAILED DESCRIPTION - Extraction of artemisinin comprises providing dried Artemisia leaf, putting into refluxing ultrasonic oscillator, adding petroleum ether, and boiling at 60-90 degrees C, where volume ratio of petroleum ether and Artemisia leaf is 1:12-16; performing ultrasonic irradiation at frequency of 25-35 kHz, power of 1200-1500 W under the action of ultrasonic, using petroleum ether, heating, refluxing and extracting for 3-5 times, where each extracting time is 30 minutes at 60-70 degrees C and filtering to obtain southernwood dregs containing artemisinin; mixing vegetable wax, volatile oil and extract of artemisinin, subjecting into silica gel column chromatography separation using petroleum ether and ethyl acetate with volume ratio of 95-98:2-5, and after mixed solution of ethyl gradient elution, collecting fractions containing artemisinin; concentrating artemisinin under reduced vacuum to 1/100-1/200 volume at 25-35 degrees C, crystallizing for 18-24 hours, filtering crystal, drying for 3-5 hours at 80-85 degrees C to obtain artemisinin crude product; and adding 60-80 times 95% alcohol to artemisinin crude product to dissolve, filtering, concentrating filtrate into concentrating tank, where concentrating proportion is 10-15% of total volume at 18-26 degrees C, crystallizing concentrated solution for 18-24 hours, filtering extracted crystal artemisinin at 80-85 degrees C, and drying crystal artemisinin for 4-6 hours to obtain artemisinin.