The　partial　nitrification-anammox　(PN-A)　is　a　promising　process　to　treat　sludge　digester　liquor.　However,　its　application　was　restricted　by　the　limited　total　nitrogen　removal　efficiency　and　the　demand　for　additional　phosphorus　removal　methods.　To　address　these　issues,　a　novel　two-stage　partial　nitrification-electrolysis　anammox　(PN-EA)　process　was　constructed　for　the　treatment　of　sludge　digester　liquor　in　this　study.　By　incorporating　a　current　control　system　and　an　iron　electrolysis　device　in　the　anammox　unit,　the　PN-EA　system　achieved　significant　phosphorus　removal　(96.58　+/-　1.41%).　X-ray　diffraction　data　demonstrated　that　vivianite-based　phosphorus　accounted　for　95.00%　of　the　total　solid　phase　in　the　EA　unit.　Additionally,　Mo　center　dot　ssbauer　spectroscopy　further　revealed　that　49.27　-　61.07%　of　the　total　iron　in　the　EA　samples　was　bound　in　vivianite.　The　intricate　composition　of　the　sludge　digester　liquor　may　potentially　lead　to　oxidation　and　impurity　occupation,　thereby　compromising　the　purity　and　recovery　rate　of　vivianite.　Furthermore,　the　symbiotic　relationship　between　Candidatus　Brocadia　and　versatile　denitrifying　bacteria　including　Denitratisoma,　Arenimonas,　Hydrogenopaga,　and　Dechloromonas　was　confirmed　through　microbial　analysis,　functional　genes　prediction,　and　enzyme　activity　analysis.　The　PN-EA　system　demonstrated　the　collaboration　of　multiple　metabolic　pathways,　such　as　anammox,　heterotrophic,　autotrophic　(hydrogen　and　Fe2+-driven),　and　electrochemical　denitrification,　resulting　in　an　impressive　total　nitrogen　removal　efficiency　of　92.60　+/-　1.36%.　This　research　contributes　to　the　broader　implementation　of　anammox　process　and　provide　new　insights　into　the　efficient　removal　of　nitrogen　and　the　recovery　of　high-quality　P　from　nutrient-rich　wastewater.