The　highly　efficient　and　green　recycling　of　sintered　Nd-Fe-B　sludge　has　emerged　as　a　pressing　concern　in　light　of　the　escalating　production　of　sludge.　In　this　work,　a　novel　ultra-short　process　strategy　of　purification-remixing　incorporation　is　proposed　for　in-situ　regeneration　across　several　types　of　Nd-Fe-B　sludges.　The　magnetic　properties　of　the　regenerated　magnets　are　effectively　restored　by　remixing　the　purified　sludge　at　30　wt%　into　customized　high-remanence　magnetic　powder,　followed　by　the　adjustment　of　rare　earth　content　to　30.5　%　using　rare　earth-rich　compounds.　For　magnets　using　48SH　sludge,　the　remanence　and　coercivity　are　recovered　to　13.8　kG　and　22.2　kOe,　respectively,　with　recovery　rates　of　97　%　and　108.3　%,　which　are　almost　as　high　as　those　of　the　original　magnets.　The　temperature　stability　of　the　magnet　is　comparable　to　that　of　the　original　magnet　as　well.　The　comprehensive　analysis　attributes　the　attainment　of　high-performance　to　the　repair　and　optimization　of　the　microstructure,　particularly　focusing　on　the　grain　boundary　phase.The　ultra-short　recovery　process　and　the　reuse　of　solvents　in　the　purification　phase　minimize　the　total　energy　consumption　and　carbon　emissions,　and　show　great　potential　for　green　recycling　for　Nd-Fe-B　sludge.　©　2024　Elsevier　B.V.