In order to find an adsorbent with good adsorption effect and convenient recovery solve the problem of heavy metal pollution wastewater treatment, a kind of magnetic biochar-MnFe₂O₄(BC/FM)composite was prepared by sol-gel method with egg white as the complexing agent, using corn straw and MnFe₂O₄ as raw materials. An adsorption test of removing Zn²⁺ and Cu²⁺ from wastewater was carried out on the basis of the scanning electron microscope and hysteresis loop analysis. The results show that MnFe₂O₄ can be effectively loaded onto the biochar to form abundant functional group and well magnetized composite materials. The best pH values of adsorption to Zn²⁺ and Cu²⁺ of BC/FM were 5 and 6, respectively, both reaching adsorption equilibrium in 90 min. The pseudo-second-order kinetic model can better describe the adsorption process of BC/FM to Zn²⁺ and Cu²⁺. The fitting results of adsorption isotherm equations consistent with the Langmuir and Freundlich adsorption isotherm model for Zn²⁺ and Cu²⁺, respectively. And the adsorption process was spontaneous and endothermic. The adsorption mechanism of Zn²⁺ and Cu²⁺ removal by BC/FM is mainly complexation.