In　this　paper,　a　Cu,　N　co-doped　TiO2　nanosheet　with　increased　visible　light　photocatalytic　activity　was　successfully　synthesized　using　a　biomimetic　layer-by-layer　deposition　process.　The　polymer,　branched-polyethyleneimine　(b-PEI)　was　used　as　an　induction　agent　for　the　hydrolysis　of　titanium　bis(ammonium　lactato)-dihydroxide　(Ti-BALDH)　as　well　as　for　a　nitrogen　resource,　and　the　graphene　oxide　(GO)　was　used　as　a　two-dimensional　nano-template.　The　positively　charged　b-PEI　will　bind　to　the　negatively　charged　GO　and　titania.　In　a　typical　layer-by-layer　deposition　process,　GO　nanosheets　are　exposed　in　an　alternating　fashion　to　aqueous　b-PEI,　CuCl2　and　Ti-BALDH　solutions,　thus,　making　the　layer-by-layer　deposition　of　a　conformal　b-PEI/Cu-Ti-O　coating　on　the　GO.　Subsequent　b-PEI　and　GO　pyrolysis　at　550　degrees　C　under　air　yielded　Cu,　N　co-doped　TiO2　nanosheets.　The　materials　obtained　were　comprehensively　investigated　by　X-ray　diffraction,　scanning　electron　microscopy,　transmission　electron　microscopy,　X-ray　photoelectron　spectroscopy,　UV-Vis　diffuse　reflectance　spectroscopy,　Raman　spectra,　photoluminescence　spectra　and　electron　paramagnetic　resonance.　The　Cu,　N　co-doped　TiO2　nanosheets　showed　obviously　enhanced　photocatalytic　activity　which　was　evaluated　by　degradation　of　methylene　blue　under　visible　light　irradiation.　This　research　might　provide　some　new　insights　for　the　＂green　synthesis＂　of　the　simultaneous　doping　of　two　kinds　of　foreign　atoms　into　TiO2　with　controlled　morphology　and　photocatalytic　properties.