As　a　promising　phosphorus　source,　phosphorus　recovery　from　sewage　sludge　ash　is　necessary　to　ensure　sustainable　phosphorus　cycle　and　management.　To　achieve　these　targets,　a　novel　strategy　including　phosphorus　capture　by　acid-resistant　adsorbent　from　acid-extract　of　sewage　sludge　ash　and　repeated　enrichment　in　eluent　was　first　proposed　in　this　study.　Over　93%　of　phosphorus　was　extracted　by　H2SO4　acidification　at　pH　of　2.0,　and　a　tailored　acid-resistant　adsorbent　recovered　almost　all　the　extracted　phosphorus　in　acid-extract　of　sewage　sludge　ash.　The　fitting　results　of　multiple　models　showed　that　the　rate-limiting　step　for　phosphorus　recovery　was　chemical　reaction,　and　the　maximum　recovery　capacity　of　acid-resistant　adsorbent　was　41.7-44.0　mg/g.　Characterization　results　of　X-ray　photoelectron　spectroscopy,　Fourier　transform　infrared　spectroscopy　and　Zeta　potential　suggested　that　the　recovery　mechanism　of　acid-resistant　adsorbent　for　phosphorus　included　ligand　exchange,　inner-sphere　complexation　and　electrostatic　attraction.　After　8　cycles　of　recovery-repeated　enrichment,　the　phosphorus　in　eluent　was　enriched　about　6.7　times.　Over　99%　of　phosphorus　in　eluent　was　recovered　as　struvite　by　adding　external　magnesium　and　ammonium　at　pH　of　8.5.　The　content　of　heavy　metals　in　recovered　struvite　were　far　below　the　utilization　standard　of　plant　fertilizer,　indicating　that　the　phosphorus　in　sewage　sludge　ash　could　be　recovered　in　the　form　of　high-quality　phosphorus　fertilizer.