The invention discloses an extraction technology of folium artemisiae argyi volatile oil. The technology comprises the steps that 1, folium artemisiae argyi is cleaned thoroughly, impurities are removed, and low-temperature drying and smashing are performed to obtain folium artemisiae argyi powder; 2, warm water is added into the folium artemisiae argyi powder till the folium artemisiae argyi powder is soaked to be expanded, and freezing treatment is performed at the temperature of subzero 6 DEG C to 0 DEG C for 2-3 h; microwave defrosting is performed on the frozen folium artemisiae argyi powder; 3, water with the weight 10-15 times that of the folium artemisiae argyi powder is added into the defrosted folium artemisiae argyi powder for soaking for 5-10 h, then, steam distillation is performed on the folium artemisiae argyi powder and the soaking solution, distillation is performed for 5-8 h, and a distillate is collected; standing, cooling and layering are performed on the distillate, and then an upper oil layer is obtained and is the folium artemisiae argyi volatile oil. According to the extraction technology of the folium artemisiae argyi volatile oil, freezing-microwave defrosting pretreatment and a steam distillation steam method are combined, volatile oil in folium artemisiae argyi is extracted, the cost is low, operation is simple, the extraction time is short, and the volatile oil extraction rate is high.