The　nickel,　cobalt,　manganese　and　lithium　metals　in　the　ternary　cathode　material　of　scrapped　power　battery　were　recovered　by　high　temperature　hydrogen　reduction　and　hydrometallurgical　method,　and　the　recovery　mechanism　and　process　were　studied.　The　results　show　that　the　Li　in　the　layered　Ni-Co-Mn　oxide　migrates　to　the　surface　and　becomes　LiOH,　LiOHH2O　and　a　small　amount　of　Li2CO3　after　high　temperature　reduction.　The　Co2+,　Ni3+　and　Mn4+　are　reduced　to　Co0,　Ni0　and　MnO,　respectively.　And　the　surface　phases　of　the　reduced　materials　are　referred　as　Ni(OH)2,　Co(OH)2　and　MnO　after　Li　leaching.　The　Li2CO3　with　99.5%　in　purity　is　obtained　from　the　water　leaching,　acid　washing,　and　precipitation　processes　of　LiOH,　LiOHH2O　and　a　small　amount　of　Li2CO3,　which　realizes　the　separation　of　Li　from　Co-Ni-Mn.　After　the　sulfuric　acid　leaching　of　the　reduced　Ni,　Co　and　MnO,　the　leaching　rates　of　Ni,　Co　and　Mn　are　96.88%,　97.23%　and　99.78%,　respectively.　The　precipitation　and　separation　rate　of　Mn　is　98.46%　after　the　oxidizing　precipitation　and　extraction　separation　of　the　leached　solution,　and　the　impurity　contents　in　CoCl2　and　NiCl2　solutions　are　less　than　10　mg/L　after　the　extraction　separation.　©　2020,　Science　Press.　All　right　reserved.