A method of preparing a nickel ferrite-based eutectic ceramic inert anode material, in which a mixture powder of NiFe.sub.2O.sub.4-based spinel powder and nickel oxide-based powder is mixed with a binder, and granulated to obtain a granular material; the granular material is subjected to compression molding under 100-200 MPa to obtain a green body, which is pre-sintered to obtain a pre-sintered body; the pre-sintered body is melted in an inert gas atmosphere to obtain a molten material; the molten material is cooled at a rate of 1-100 C./min and solidified to obtain a ceramic solidified body; and the ceramic solidified body is processed at 1250-1400 C. for 2-6 h, and cooled to room temperature at a rate of 1-50 C./min to obtain the nickel ferrate-based eutectic ceramic inert anode material.