In　this　study,　pig　manure　rich　in　phosphorus　was　used　as　the　recovery　object,　In　order　to　realize　the　maximum　recovery　of　phosphorus　resources　in　pig　manure,　this　study　established　a　phosphorus　recovery　route　combining　the　electrochemical　method　with　the　Vivianite　method　using　sacrificial　iron　anode.　And　in　order　to　obtain　phosphorus　rich　supernatant,　pig　manure　was　treated　with　different　pH　values,　and　the　changes　in　phosphorus　components　and　metal　content　in　the　liquid　phase　were　mainly　investigated;　Graded　phosphorus　components　and　microbial　communities　in　the　solid　phase;　Finally,　the　effect　of　electrolytic　recovery　of　phosphorus　from　fermentation　supernatant　was　studied.　The　results　showed　that　the　highest　total　phosphorus　(TP)　content　in　the　liquid　phase　follows　a　trend　of　acidity　＞　control　＞　alkalinity;　The　analysis　of　the　results　of　solid-phase　phosphorus　fractionation　extraction　shows　that　acidic　conditions　are　more　conducive　to　the　release　of　Non-apatite　inorganic　phosphorus　(NAIP)　and　Apatite　inorganic　phosphorus　(AP);　The　microbial　community　promotes　the　release　of　phosphorus　by　participating　in　the　decomposition　of　fermentation　substrates;　The　analysis　of　the　change　of　metal　content　in　the　liquid　phase　before　and　after　electrolysis　showed　that　the　two　chamber　electrolytic　cell　can　not　remove　other　metal　components　while　recovering　the　vivianite;　More　than　90%　of　the　phosphorus　in　the　supernatant　after　fermentation　was　recovered　by　electrolysis.　The　characterization　results　showed　that　84.66%　of　the　precipitate　was　Vivianite.