Light-driven　heterogeneous　photocatalysis　has　gained　great　significance　for　generating　solar　fuel;　the　challenging　charge　separation　process　and　sluggish　surface　catalytic　reactions　significantly　restrict　the　progress　of　solar　energy　conversion　using　a　semiconductor　photocatalyst.　Herein,　we　propose　a　novel　and　feasible　strategy　to　incorporate　dihydroxy　benzene　(DHB)　as　a　conjugated　monomer　within　the　framework　of　urea　containing　CN　(CNU-DHBx)　to　tune　the　electronic　conductivity　and　charge　separation　due　to　the　aromaticity　of　the　benzene　ring,　which　acts　as　an　electron-donating　species.　Systematic　characterizations　such　as　SPV,　PL,　XPS,　DRS,　and　TRPL　demonstrated　that　the　incorporation　of　the　DHB　monomer　greatly　enhanced　the　photocatalytic　CO2　reduction　of　CN　due　to　the　enhanced　charge　separation　and　modulation　of　the　ionic　mobility.　The　significantly　enhanced　photocatalytic　activity　of　CNU-DHB15.0　in　comparison　with　parental　CN　was　85　mu　mol/h　for　CO　and　19.92　mu　mol/h　of　the　H-2　source.　It　can　be　attributed　to　the　electron-hole　pair　separation　and　enhance　the　optical　adsorption　due　to　the　presence　of　DHB.　Furthermore,　this　remarkable　modification　affected　the　chemical　composition,　bandgap,　and　surface　area,　encouraging　the　controlled　detachment　of　light-produced　photons　and　making　it　the　ideal　choice　for　CO2　photoreduction.　Our　research　findings　potentially　offer　a　solution　for　tuning　complex　charge　separation　and　catalytic　reactions　in　photocatalysis　that　could　practically　lead　to　the　generation　of　artificial　photocatalysts　for　efficient　solar　energy　into　chemical　energy　conversion.