The invention provides a method for extracting glycyrrhizic acid and liquorice
flavonoid by using a continuous countercurrent ultrasonic extraction
machine. The scheme process comprises the following steps of: 1, conveying liquorice subjected to treatment into an extraction
pipe of the continuous countercurrent ultrasonic extraction
machine through a quantitative feeder and inputting an extracting
solvent into the extraction
pipe from a dreg-discharging end of the ultrasonic extraction
machine; 2, performing countercurrent ultrasonic extraction on the liquorice and the extracting
solvent in the extraction
pipe at the temperature of between 30 and 60 DEG C and under normal pressure; 3, after countercurrent ultrasonic extraction, discharging the liquorice dreg from a dreg-discharging port of the ultrasonic extraction machine, treating the liquorice dreg, recovering the
solvent, and discharging the extracting solution from a liquid-discharging port of the ultrasonic extraction machine; 4, performing dreg liquid separation on the extracting solution and concentrating by using a concentrating tank to obtain a concentrated solution; and 5, performing
solid liquid separation on the concentrated solution,
drying the obtained
solid to obtain a liquorice
flavonoid product, adjusting pH value of the separated liquid by using inorganic acid, performing
solid liquid separation,
drying the separated solid to obtain a glycyrrhizic acid finished product, and concentrating and
drying the separated liquid to obtain a mixture of angelica
polysaccharide, liquorice
flavonoid and glycyrrhizic acid.