Based　on　the　life　cycle　concept　of　oil　sludge　waste　from　the　NdFeB　manufacturing　process,　the　process　technology　route　was　investigated　to　recover　valuable　elements　from　the　oil　sludge　waste　by　hydro-metallurgical　refining　and　calcium　reduction　to　fabricate　a　sintered　NdFeB　magnet.　The　life　cycle　list　was　calculated　and　the　environmental　impact　of　the　main　processes　was　examined　using　the　ReCiPe　method,　and　the　main　factors　of　environmental　impact　were　identified.　The　results　showed　that　the　hydrometallurgical　technology　route,　compared　with　the　calcium　reduction　technology　route,　resulted　in　119.84%　of　human　health　hazards,　119.84%　of　ecological　damage　and　119.84%　of　resource.　The　consumption　was　found　to　be　13.08%　higher　than　that　of　FDP.　The　sensitivity　analysis　revealed　that　the　production　of　hydrochloric　acid　was　highly　sensitive　to　FDP,　and　power　consumption　was　high　to　WTP　in　the　hydrometallurgical　technology　route,　and　WTP　in　the　calcium　reduction　unit　process,　and　HTP　in　all　processes　in　the　calcium　reduction　technology　route.　The　overall　results　show　that　reducing　the　environmental　impact　in　the　calcium　reduction　recovery　process　and　accelerating　the　clean　production　of　China＇s　power　resources　are　of　great　significance　for　the　recovery　of　oil　sludge　waste　for　the　preparation　of　recycled　sintered　NdFeB.　©　2021　Trans　Tech　Publications　Ltd,　Switzerland.