Recycling　of　waste　sintered　Nd-Fe-B　permanent　magnets　by　doping　DyH3　nanoparticles　was　investigated.　The　effect　of　the　DyH3　nanoparticles　on　the　microstructure　and　magnetic　properties　of　the　recycled　magnets　was　studied.　As　the　DyH3　nanoparticles　additive　increased,　the　coercivity　of　recycled　magnet　increased　gradually.　The　recycled　magnets　with　DyH3　nanoparticle　content　between　0.0　wt.%　and　1.0　wt.%　maintained　the　remanence　(B-r),　but,　with　higher　additions,　the　B-r　began　to　decrease　rapidly.　The　best　recycled　magnet　produced　contained　1.0　wt.%　of　DyH3　nanoparticles　when　compared　to　the　properties　of　the　starting　waste　sintering　magnet.　The　H-cj,　B-r　and　(B-H)(max)　values　of　101.7%,　95.4%,　and　88.58%,　respectively,　were　recovered.