The invention discloses a technology for removing Fe and Zn impurities in mischmetal liquid by using a synergistic extraction method. The method comprises the following steps that, (1) the low- acidity mischmetal liquid obtained after hydrochloric acid leaching is used as a raw material; (2) any two kinds of N235, N1902, TBP are selected and mixed as a synergistic extraction agent, and the synergistic extraction agent and diluent are mixed to obtain synergistic extraction organic phase; and (3) the synergistic extraction organic phase and the mischmetal liquid are mixed to obtain raffinate, after removing the Fe and Zn elements, and mixed liquor of Fe<3+> and Zn<2+>. The Fe<3+>and Zn<2+> in the mischmetal liquid can be separated at a lower cost, and the rare earth element loss is low, so that energy saving and environmental protection are achieved, and the enterprise income can be improved, the technology has a good market prospect, and the finally-obtained lanthanum products are of high purity, the using requirements of modern industry can be better meet.