Nowadays,　indoor　air　pollution　of　low-concentration　formaldehyde　(HCHO)　is　threatening　seriously　human　health.　In　this　work,　a　carbon　cloth　supported　MnOx　composite　(MnOx-CC)　with　coaxial　cable　structure　was　synthesized　as　catalysts　by　electric-enhanced　hydrothermal　synthesis.　The　MnOx-CC　catalysts　showed　a　flower　liked　MnOx　nanospheres　structure　with　interconnected　nanosheets.　During　the　static　testing,　the　HCHO　concentration　can　be　reduced　from　7　ppm　to　0.074　ppm　at　25　celcius,　which　is　below　the　international　guideline　values　(0.08　ppm).　Under　the　WHSV　of　similar　to　120,000　mL/(g(MnOx)h),　the　removal　efficiency　was　as　high　as　-97%　and　the　catalyst　can　keep　working　for　24　h　without　an　significant　drop　at　room　temperature.　A　novel　mechanism　-　synergistic　catalytic　effect　mechanism　of　MnOx　was　proposed　to　illuminate　the　catalyst　performance.　It　reveals　that　the　mutual　conversion　process　among　different　valences　of　MnO2,　Mn2O3　and　MnO　is　critical　to　the　generation　of　active　oxygen　and　decomposition　of　intermediates,　and　they　jointly　promote　the　effective　degradation　of　HCHO.　This　work　may　provide　a　new　strategy　to　synthesizing　the　catalysts　for　HCHO　removal　with　high　efficiency　and　present　an　insight　for　catalytic　process　of　MnOx.