According　to　the　characteristics　of　high　ammonia　nitrogen　and　low　C/N,　a　pilot　study　on　nitrogen　and　carbon　removal　of　food　waste　digestate　was　carried　out　by　using　the　process　of　＂micro　oxygen　aeration　-　one-stage　anaerobic　ammonia　oxidation-BioClens　denitrification.　The　results　showed　that　the　average　removal　rates　of　COD　and　TN　reached　81.3%　and　81.8%　after　150　d　of　operation　optimization.　The　micro　oxygen　aeration　unit　eliminated　the　effect　of　organic　matter　and　retained　NH4+-N　from　the　food　waste　digestate　for　the　anaerobic　ammonia　oxidation　unit,　which　removed　81.6%　of　COD　and　13.7%　of　NH4+-N　and　provided　assurance　for　stable　operation　of　anaerobic　ammonia　oxidation.　The　anaerobic　ammonia　oxidation　unit　was　the　main　NH4+-N　removal　unit　and　the　average　total　nitrogen　removal　rate　after　stabilization　was　0.480　kgN·(m3·d)−1.　The　BioClens　denitrification　unit　removed　the　NO3−-N　generated　in　the　first　two　stages　of　the　process,　and　its　average　NO3−-N　removal　rate　reached　90%　with　sodium　acetate　as　the　carbon　source　and　an　encapsulated　immobilized　filler　filling　ratio　of　5%　and　C/N=3.　The　process　achieved　an　economical　and　efficient　treatment　of　food　waste　digestate　and　will　have　broad　application　prospects.　©　2023　Science　Press.　All　rights　reserved.