The invention discloses an extraction method for artemisia argyi essential oil. The method comprises the following steps: raw material pretreatment, microwave assisted extraction, compound enzyme assisted extraction, steam distillation extraction, condensation and refining. According to the method, artemisia argyi leaves are placed in distilled water for ultrasonic cleaning, so that impurities such as protein and glucose can be simply, conveniently and effectively removed from surfaces of the artemisia argyi leaves, the generation of the impurities during essential oil extraction is reduced, the aim of improving purity of the essential oil is achieved, and extraction cost increase resulting from traditional solvent cleaning and the influence on the purity of the essential oil caused by solvent residual are avoided. Then, microwave assisted extraction, compound enzyme assisted extraction, steam distillation extraction and molecular distillation are combined, cell wall rupture and localswelling of intercellular substances are achieved by microwave assisted extraction and compound enzyme assisted extraction, and thus, intracellular substances are more easily dissolved out; subsequently, the essential oil is thoroughly refined by steam distillation extraction; finally, refining is carried out by molecular distillation, the separation of lightweight molecules from heavy molecules is achieved by dint of difference among mean free paths of molecular movement of different substances, and thus, the purity of the artemisia argyi essential oil is greatly improved.