The citric acid sol-gel method is used to prepare a mono-calcium nanoferrite (CaFe₂ O₄ ) integrated catalyst loaded onto cordierite honeycomb ceramics. Through process optimization, the optimal preparation parameters are determined as: a molar ratio of citric acid to calcium-iron ions of 2. 5, and a calcination temperature of 700 ℃. Characterization results show that under these conditions,CaFe₂ O₄ synthesized has good crystallinity and significantly increased diffraction peak intensity;The material has a large specific surface area and a bimodal pore size distribution— mainly concentrated in microporous regions (average pore size 1. 88 nm),accompanied by mesoporous structures with an average pore size of 7. 31 nm. The microstructure shows that the catalyst framework is composed of crosslinked nanoparticles,with a rough and porous surface. Activity evaluation results show that this catalyst demonstrates excellent catalytic activity against methane oxidative combustion, with ignition temperatures ( T₅₀ ) and complete conversion temperatures (T₉₀ ) of 492 ℃ and 575 ℃ respectively,significantly better than the blank control group.