Microwave-assisted　selective　catalytic　reduction　of　nitrogen　oxides　(NOx)　was　investigated　over　Ni-based　metal　oxides.　The　NiMn2O4　and　NiCo2O4　catalysts　were　synthesized　by　the　co-precipitation　method　and　their　activities　were　evaluated　as　potential　candidate　catalysts　for　low-temperature　NH3-SCR　in　a　microwave　field.　The　physicochemical　properties　and　structures　of　the　catalysts　were　characterized　by　X-ray　diffraction　(XRD),　Scanning　electron　microscope　(SEM),　N-2-physisorption,　NO　adsorption-desorption　in　the　microwave　field,　H-2-temperature　programmed　reduction　(H-2-TPR)　and　NH3-temperature　programmed　desorption　(NH3-TPD).　The　results　verified　that　microwave　radiation　reduced　the　reaction　temperature　required　for　NH3-SCR　compared　to　conventional　heating,　which　needed　less　energy.　For　the　NiMn2O4　catalyst,　the　catalytic　efficiency　exceeded　90%　at　70　C　and　reached　96.8%　at　110　C　in　the　microwave　field.　Meanwhile,　the　NiMn2O4　also　exhibited　excellent　low-temperature　NH3-SCR　reaction　performance　under　conventional　heating　conditions,　which　is　due　to　the　high　BET　specific　surface　area,　more　suitable　redox　property,　good　NO　adsorption-desorption　in　the　microwave　field　and　rich　acidic　sites.