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The design and synthesis of highly efficient and low-temperature NO x reduction catalysts with long-term stability and good water resistance still remain a challenge in the field of gas catalysis. In this work, we demonstrated the integration of MnO x -Fe 2 O 3 /TiO 2 /Ti monolithic catalysts on flexible Ti mesh through plasma electrolytic oxidation technology, associated with hydrothermal reaction, and chemical bath deposition methods. The in-situ grown TiO 2 nanosheet supports hold a very strong substrate adhesion with Ti mesh, and provide ideal nucleation sites for the following deposition of high density of MnO x -Fe 2 O 3 active components. The brush-like nanostructure morphology of active MnO x -Fe 2 O 3 catalysts enables the complete adsorption and reaction of gas molecules on the catalyst surface. The selective catalytic reduction of NO x with NH 3 tests indicate that MnO x -Fe 2 O 3 /TiO 2 /Ti monolithic catalysts exhibit excellent low-temperature catalytic performance with 100% of NO x conversion at 137 °C, good stability and water resistance, showing great potential and broad application prospects in comparison with powder catalysts and honeycomb ceramic catalysts. The strategy of depositing multi-components active catalysts on in-situ grown ultra-thin TiO 2 nanosheet supports on flexible Ti mesh paves a solid way toward the practical applications of novel low-temperature selective catalytic reduction catalysts in diverse fields. [Display omitted] • TiO 2 nanosheet array in-situ grown on the Ti mesh serves as ideal substrate for Mn-Fe active component deposition. • Needle-like MnO x -Fe 2 O 3 heterostructure nanowires have large surface area and strong synergistic effect. • MnO x -Fe 2 O 3 /TiO 2 /Ti monolithic catalysts exhibit excellent low-temperature catalytic performance and good stability. [ABSTRACT FROM AUTHOR]