A　Fe-doped　graphite-like　carbon　nitride　(g-C3N4)　nanocomposites　containing　various　Fe　contents　(5　wt.%,　10　wt.　%　and　15　wt.%)　were　prepared　via　two-step　calcination　thermal　polymerization,　and　were　employed　as　efficient　heterogeneous　photo-Fenton　composites　towards　rhodamine　B　(RhB)　removal　in　visible-light/H2O2　system.　The　sheet　structure　of　g-C3N4　was　refined　down　to　nano-scale　and　less　densely　packed　by　the　increasing　Fe-doping　ratio.　X-ray　diffraction　(XRD),　Fourier　transform　infrared　(FTIR)　and　X-ray　photoelectron　spectroscopy　(XPS)　spectra　indicated　that　Fe　was　doped　completely　into　the　g-C3N4　lattice.　Over　90　%RhB　was　degraded　in　photo-Fenton　system　within　45　min　under　the　optimal　Fe-doping　ratio　of　10　wt.%　(10　%　Fe-g-C3N4).　The　degradation　efficiency　of　photo-Fenton　was　superior　in　comparison　with　photocatalysis　and　Fenton　reaction.　The　as-prepared　composite　exhibited　excellent　performance　(similar　to　90　%　removal)　and　high　stability　in　a　wide　range　of　pH　value　(3　similar　to　9),　and　the　degradation　data　well　fitted　with　the　pseudo-first-order　kinetics　model.　The　enhanced　photo-Fenton　catalytic　activity　benefited　from　the　Z-scheme　heterojunctions　of　Fe-g-C3N4,　which　improved　the　separation　ability　of　photo-generated　charge　carriers　and　increased　the　electrons　that　participated　in　Fe2+/Fe3+　cycle.　The　main　active　oxygen　species　of　Fe-g-C3N4　were　hydroxyl　radicals,　followed　by　superoxide　radicals　and　electron　holes.　The　effect　of　Fe-doping　was　revealed　by　density　functional　theory　calculation.　The　excellent　recyclability　and　stability　of　Fe-g-C3N4　catalyst　was　also　observed.　Such　photo-Fenton　system　was　also　effective　to　degrade　other　organic　pollutants.　The　findings　reported　here　offer　promising　implications　in　developing　the　utilization　of　Fe-g-C3N4　composite　in　photo-Fenton　system　for　treatment　of　wastewater.