Spin　catalysis　uses　magnetic　catalysts　to　overcome　the　spin-prohibited　process　in　chemical　reactions,　which　so　far　is　mostly　limited　to　triplet　oxygen　generation　in　water　oxidation.　Here,　we　report　the　spinenhanced　urea　electrosynthesis　on　the　catalyst　of　diluted　magnetic　oxides　(Cu-In2O3),　in　which　the　limiting　potential　of　urea　production　is　qualitatively　eliminated　under　a　magnetic　field.　Magneto-electrochemical　infrared　spectroscopy　is　used　to　reveal　the　key　C-N　intermediate　of　*NHCOOH　formed　by　*CO2　and　*NH2.　Its　rate-determining　step　of　hydrogen　transfer　(HT)　is　sensitive　to　the　spin　states　on　CuIn2O3　catalyst.　When　the　Cu　site　has　a　fixed　spin　orientation　under　an　applied　field,　the　adsorbed　*CO2　with　*NH2　through　hydrogen　bonding.　The　antiparallel　spins　further　facilitate　the　breakage　of　N-H　bonds　and　the　formation　of　O-H　bonds　in　HT,　as　evidenced　by　the　kinetic　isotope　effect.　The　spin-enhanced　HT　process　lowers　the　energy　barrier　for　C-N　coupling,　which　extends　the　concept　of　spin　catalysis　to　the　synthesis　of　value-added　C-N　chemicals.