The　development　of　full-spectrum　composite　photocatalysts　is　a　promising　approach　to　enhance　solar　energy　utilization.　In　this　study,　the　FeTiO3/NaYF4:　Yb,　Dy,　Nd　(FNYDN)　upconversion　composite　photocatalysts　were　successfully　synthesized　via　the　hydrothermal　method.　The　upconversion　effect　of　rare　earth　ions　on　near-infrared　light　is　utilized　to　broaden　the　absorption　range　of　visible　light,　thereby　further　improving　the　efficiency　of　solar　energy　utilization.　Compared　to　pure　FeTiO3　(80.83　%)　and　NaYF4　(37.76　%),　the　0.75　FNYDN　(93.51　%)　samples　showed　significantly　higher　photo-Fenton　activity　for　degradating　antibiotics　under　visible-near　infrared　(Vis-NIR)　light.　The　upconversion　luminescence　at　980　nm　and　visible　near-infrared　(UV-Vis-NIR)　spectrophotometer　indicate　that　the　incorporation　of　NaYF4:　Yb,　Dy,　Nd　(NYDN)　can　broaden　the　utilization　of　near　infrared　light,　enhancing　the　degradation　activity　of　organic　pollutants　under　the　NIR-light　irradiation.　Particularly,　in　the　NIR　light　condition,　the　degradation　efficiency　of　TCH　by　0.75　FNYDN　can　go　up　to　86.72　%　due　to　upconversion　function　of　rare　earth　ions.　Besides,　several　characterizations　suggest　that　the　formation　of　Z-Scheme　heterojunction　between　FeTiO3　and　NYDN　enables　effective　separation　and　transfer　of　photocarriers.　Thus,　the　enhanced　photo-Fenton　activity　of　the　0.75　FNYDN　heterojunction　can　be　attributed　to　the　synergistic　effects　of　upconversion　and　the　Z-Scheme　heterojunction.　This　experimental　investigation　provides　a　sound　basis　for　the　preparation　of　efficient　upconversion　composite　photocatalysts.　©　2025　Elsevier　B.V.