The　escalating　presence　of　pharmaceutical　antibiotics　in　natural　water　poses　an　overwhelming　threat　to　the　sustainable　development　of　society.　Photocatalysis　technology　stands　out　as　a　promising　and　cutting-edge　environmental　purification　alternative.　C3N5,　identified　as　a　distinctive　nonprecious　nonmetal　photocatalyst,　holds　potential　for　originating　from　the　sluggish　photoreaction　kinetics　and　severe　photo-carrier　reunion.　Currently,　the　design　of　a　special　Sscheme　photosystem　proves　to　be　a　reliable　strategy　for　obtaining　outstanding　photocatalysts.　In　this　context,　a　plasmonic　S-scheme　photosystem　involving　Ag/Ag3PO4/C3N5　was　developed　through　a　feasible　route.　The　compactly　connected　0D/0D/2D　Ag/Ag3PO4/C3N5　heterostructure,　benefitting　from　the　synergy　between　the　plasmonic　effect　and　the　S-scheme　junction,　facilitates　the　efficient　utilization　of　appreciably　reinforced　sunlight　absorption,　effective　photo-carrier　disassociation,　and　notable　photoredox　capacity.　Consequently,　this　system　generates　center　dot　OH　and　center　dot　O2　-　effectively.　Ag/Ag3PO4/C3N5　demonstrates　a　superb　photocatalytic　levofloxacin　eradication　rate　of　0.0362　min-1,　marking　a　substantial　advancement　of　24.8,　1.1,　and　0.7　folds　compared　to　C3N5,　Ag3PO4,　and　Ag3PO4/C3N5,　respectively.　Impressively,　Ag/Ag3PO4/C3N5　delivers　remarkable　anti-interference　performance　and　reusability.　This　achievement　signifies　a　significant　step　toward　developing　potent　C3N5-involved　photosystems　for　environmental　purification.