Extraction　of　molybdenum　(Mo)　and　tungsten　(W)　from　waste　alloy　significantly　impacts　the　alleviation　of　resource　shortage　and　ecological　environment.　In　this　study,　Mn　additive　was　utilized　as　a　recyclable　roasting　aid　to　convert　Mo　and　W　for　facilitating　extraction,　by　considering　thermodynamic　calculations.　The　effect　of　beta-MnO2　as　a　roasting　additive　on　the　phase　evolution　of　Mo,　W,　and　Mn　elements　and　the　optimal　process　conditions　were　evaluated　by　XRD,　SEM-EDS,　thermal　analysis,　and　alkali　leaching　experiments.　Notably,　Mo　and　W　in　the　alloy　waste　got　oxidized　and　converted　into　soluble　MnMoO4　and　MnWO4,　respectively,　under　the　conditions　of　roasting　temperature　of　750　degrees　C,　beta-MnO2　amount　of　75%　of　waste　alloy　mass,　and　time　of　1　h.　During　alkaline　leaching,　100.00%　Mo　and　99.59%　W　in　the　roasted　product　were　extracted,　which　was　accompanied　with　the　precipitation　of　leached　residue　of　alpha-MnO2,　Mn3O4,　and　Mn2O3　from　Mn　present　in　the　leach　liquor　(NaOH　concentration　2　mol　center　dot　L-1,　solid-liquid　ratio　10%　(w/v),　time　5　h,　temperature　90　degrees　C).　When　the　recycled　leached　residue　was　employed　in　the　next　roasting　process,　the　leaching　efficiency　of　Mo　and　W　was　maintained　above　98.56%.　Moreover,　the　reaction　mechanisms　of　roasting　and　leaching　were　investigated　by　kinetics　study.　Roasting　with　beta-MnO2　fundamentally　reduced　the　production　cost　with　the　high　extraction　efficiency　of　Mo　and　W,　and　the　flue　gas　recovery　process　was　no　longer　required,　which　is　beneficial　to　industrial　application.