Abstract: Transition metal oxide MnO_x has shown great potential in catalyzing the degradation of formaldehyde (HCHO) pollution at room temperature, however, the accumulation of intermediate products during the catalytic process can easily lead to a decrease in catalytic performance. Hereon, a MnO_x nanorod composite catalyst anchored by CeF₃ nanoparticles on carbon cloth (CC) substrate was prepared using a hydrothermal deposition method, and an electric field assisted catalytic oxidation strategy was proposed. Results show that in the dynamic performance test of HCHO, compared with no electric field assistance, the HCHO conversion rate of CeF₃/MnO_x-CC with electric field assistance increases from 65.8% to 76.6%, and there is no significant attenuation within 72 hours. This composite catalyst utilizes the high electronegativity of fluorine and the auxiliary effect of electric field to promote the release of lattice oxygen on the catalyst surface and the formation of active oxygen species O*, accelerate the decomposition of intermediate products, and thus improve the catalytic efficiency and lifespan of HCHO. The electric field assisted catalytic strategy proposed in this article provides a new approach for the efficient and long-term degradation of gaseous pollutants at room temperature.