A method of promoting the treatment of coking wastewater using photocatalytic electrode coupled with microbial fuel cellin the technical field of coking wastewater treatment, energy-saving and resource utilization. La-ZnIn2S4/RGO/BiVO4 and silica sol were fixed and coated on stainless steel mesh to form conductive catalytic composite membrane electrode. HSO3−was added to coking wastewater. Graphite Carbon rods are inserted into the anodic chamber with microorganisms and connected the cathode with wires to form circuit loops. Halogen tungsten lamp was applied as light source to act on the catalytic electrode, forming a coupled system with photocatalytic electrode and microbial fuel cell for treating coking wastewater. The effects of La-ZnIn2S4/RGO/BiVO4 catalysts with different RGO contents on the catalytic degradation of coking wastewater were realized, and the effects of NaHSO3 and Na2SO4 solutions at the same concentration on the degradation of coking wastewater were also realized.