The invention belongs to the technical field of sewage treatment, and particularly relates to a method and a device for strengthening electro-Fenton water treatment. According to the invention, a chemical bag containing oxalate is added into an electrochemical reduction tank of an electro-Fenton reaction device, and Ti@TiO2 is used as a negative electrode; the electrochemical reduction tank contains wastewater; oxalate in the chemical bag is complexed with Fe<3+> generated by a Fenton reaction to generate an iron complex; and through the interaction between the iron complex and a Ti@TiO2 negative electrode material, the transmission of electrons is promoted, the reduction rate of Fe<3+> is increased, Fe<2+> consumed by the Fenton reaction is continuously supplemented, the degradation efficiency of the Fenton reaction is improved, and the iron sludge yield of a Fenton reaction system is reduced.