The　advanced　nitrogen　removal　of　mature　landfill　leachate　(MLL)　with　low　carbon　to　nitrogen　ratio　(C/N)　is　a　topic　worthy　of　further　research.　A　two-stage　partial　nitrification/anammox　(PN/A)　system　for　integrated　MLL　and　kitchen　waste　digestion　liquid　(KWDL)　treatment　was　established　in　this　study.　The　nitrogen　removal　efficiency　(NRE)　of　this　process　was　98.1　+/-　1.3　%,　with　an　effluent　TIN　concentration　of　15.2　+/-　1.8　mg/L.　In　the　partial　nitrification-sequencing　batch　reactor　(PN-SBR),　aerobic　hydraulic　retention　time　(HRT)　accounted　for　just　36.4　%　of　the　whole　process　with　dissolved　oxygen　(DO)　＜　0.3　mg/L,　which　significantly　reduced　energy　consumption.　Furthermore,　the　introduction　of　KWDL　heightened　anoxic　denitrification　and　aerobic　simultaneous　nitrification　and　denitrification　(SND)　processes,　contributing　to　74.2　+/-　4.3　%　and　25.8　+/-　4.3　%　of　the　total　NRE,　respectively.　This　greatly　strengthened　the　nitrogen　removal　capacity　of　PN-SBR.　Batch　tests　indicated　that　the　capacity　of　KWDL　as　a　carbon　source　to　drive　the　process　of　partial　denitrification　coupled　with　anammox　(PDA)　was　equal　to　that　of　sodium　acetate.　Adding　KWDL　in　the　later　phase　of　each　cycle　in　the　anammox-sequencing　batch　reactor　(A-SBR)　facilitated　achieving　stable　PDA　and　advanced　nitrogen　removal.　The　nitrate　accumulation　problem　in　the　traditional　two-stage　PN/A　process　has　been　resolved　without　the　addition　of　carbon　sources.　Nitrosomonas　(3.7　%-＞　7.9　%),　Thauera　(0.04　%-＞　40.7　%)　and　a　salt-tolerant　AnAOB　microbe,　unclassified_f_Brocadiaceae　(0　%-＞　5.3　%)　were　dominant　in　the　combined　system.　This　study　revealed　a　pioneering　avenue　for　efficient　high-strength　wastewater　treatment.