A preparation method of photoelectric catalytic material zinc ferrite film from Pb/Zn tailings belongs to photocatalysis new material technical field. The technology is: smashing, baking, acid washing Pb/Zn tailings, depositing iron element, depositing zinc element, dissolving, preparing sol, cleaning, filming, photoelectric catalyzing. The invention has advantages: the novel photoelectric catalytic zinc ferrite film is prepared by phhotocatalyst composed of spinel type semiconductor with the addition of anode bias, can improve phhotocatalytic activity greatly; the zinc ferrite phhotocatalysis film without disadvantages of suspending phase phhotocatalysis powder easily agglomerating in degradation liquid, difficult to recovery, high loss of active ingredient has nanometer effect and high catalytic activity, so has theoretical research and actual application value. Moreover, the method has simple technology, accords with environmental protection requirement, has opened up a preparation method of high added value products by utilizing Pb/Zn tailings.