The　high-value　recovery　of　the　rare　earth　secondary　resources　from　sintered　Nd-Fe-B　sludge　is　of　great　significance　to　the　sustainable　supply　of　rare　earth.　This　work　aims　to　reutilize　the　Nd-Fe-B　sludge　through　an　ultra-short　process　of　purification-remixing　and　investigate　the　magnetic,　and　mechanical　properties　of　the　regenerated　magnets　to　achieve　their　commercial　application.　A　series　of　regenerated　magnets　containing　5　∼　20　wt%　of　purified　Nd-Fe-B　sludge　were　prepared,　followed　by　an　analysis　of　the　performance　and　structural　evolution.　The　results　demonstrate　that　the　magnetic　performance　of　the　regenerated　magnets　with　5　∼　10　wt%　purified　sludge　is　comparable　to　the　original　magnets　with　an　extremely　limited　reduction.　In　terms　of　mechanical　properties,　tensile　strength　declines　and　modulus　increases　slightly,　but　it　still　meets　the　requirements　of　commercial　applications.　For　both　magnets,　after　the　grain　boundary　diffusion　using　0.5　wt%-Tb,　the　coercivity　exceeds　23　kOe,　with　high　remanence　and　maximum　magnetic　energy,　greatly　expanding　the　application　field.　Analysis　of　phase,　composition　and　microstructure　reveals　that　the　addition　of　purified　Nd-Fe-B　sludge　introduces　more　oxides,　deteriorating　the　microstructure,　which　is　the　primary　reason　for　the　reduction　in　magnetic　performance　and　tensile　strength　of　the　regenerated　magnets.　In　general,　a　certain　amount　of　addition　less　than　10　%　can　realize　the　efficient　reutilization　of　sintered　Nd-Fe-B　sludge　and　meet　the　requirements　of　timely　disposal　as　well.　©　2025