Transition　metal　oxide　MnOx　shows　great　potential　in　catalytic　formaldehyde　(HCHO)　pollution　degradation　at　room　temperature,　but　it　is　difficult　to　effectively　overcome　the　catalyst　deactivation　caused　by　the　accumulation　of　intermediates.　Hereon,　a　3D　conductive　aerogel　catalyst　with　cellulose　nanofibers　(CNF)　skeleton　supported　MnOx　nanoflowers　and　carbon　black　(CB)　was　prepared　by　freeze-drying.　Based　on　the　aerogel　catalyst　(MnOx/CB/CNF),　an　electro-injection-enhanced　catalytic　oxidation　(EICO)　strategy　was　proposed　for　HCHO　degradation　by　promoting　the　formation　lattice　oxygen　and　reactive　oxygen　species　O*.　In　the　dynamic　test　(similar　to　15　ppm　at　the　weight　hourly　space　velocity　(WHSV)　of　600000　mL/g(MnOx)center　dot　h),　the　HCHO-to-CO2　conversion　efficiency　of　MnOx/CB/CNF　by　electro-injection　can　be　enhanced　to　76.27%,　which　is　26.4%　higher　than　that　without　electroinjection,　and　the　corresponding　dynamic　efficiency　did　not　show　a　decreasing　trend　within　72　h.　This　proposed　EICO　strategy　may　realize　the　efficient　and　long-term　pollutant　degradation　at　room　temperature.