The　magnetic　quantum　phenomena　triggered　by　electrons　in　carbon-based　materials　are　challenging　to　decipher　and　exploit,　thus　sparking　extensive　research　interest.　Carbon　quantum　dots　(CQDs),　emerging　candidates　in　nanomedicine,　exhibit　fascinating　behaviors　related　to　electron　spin,　relaxation,　and　migration.　Herein,　we　report　a　magnetic　edge　state　structure　within　nonmetallic　CQDs　that　generates　nitrogen　hyperfine　splitting　at　room　temperature.　Furthermore,　a　series　of　near-infrared　(NIR)　absorption　bandgaps　are　produced　based　on　spin-orbit　coupling　and　dipole-dipole　interactions,　exhibiting　potential　in　photothermal　and　thermoelectric　catalysis.　By　modulating　the　surface　ligands　and　solvent,　relaxation　rates　are　accelerated　through　spin　averaging,　which　results　in　CQDs　serving　as　desirable　T1　contrast　agents　with　the　highest　relaxivity　for　magnetic　resonance　imaging　(MRI)　and　NIR-II　cancer　therapy　agents.　Combining　these　characteristics,　we　propose　an　MRI-guided　approach　to　precision　cancer　therapy　that　offers　a　pathway　for　the　rapid　advancement　of　nanomedicine.