The　construction　of　step-scheme　(S-scheme)　heterojunction　has　become　an　effective　strategy　for　enhancing　photocatalytic　CO2　reduction.　In　this　study,　a　sunflower-like　S-scheme　WO3/ZnIn2S4　heterostructure　is　fabricated　through　the　in-situ　growth　of　ZnIn2S4　nanosheets　on　WO3　hollow　sphere,　aimed　at　improving　selective　CO2　reduction.　The　constructed　embedding　configuration,　featuring　a　WO3　hollow　sphere　core　and　an　outer　layer　of　ZnIn2S4　nanosheet,　increases　the　contact　interface　and　establishes　a　significant　built-in　electric　field,　thereby　promoting　the　migration　and　separation　of　photogenerated　carriers.　The　confined　internal　cavity　of　the　three-dimensional　(3D)　sunflower-like　architecture　aids　in　limiting　the　free　diffusion　of　CO2,　and　enriching　CO2　molecules　at　the　surface　of　the　photocatalyst,　consequently　enhancing　reaction　kinetics.　Moreover,　S　vacancies　on　ZnIn2S4　nanosheets　promote　the　chemisorption　and　activation　of　CO2.　As　a　result,　the　optimized　evolution　rates　for　CH4　and　CO　of　58.7μmol　g–1h−1　and　51.3μmol　g–1h−1,　respectively,　are　achieved　for　WO3/ZnIn2S4　heterojunction.　The　corresponding　electron　selectivity　for　CH4　reaches　82.1　%,　which　is　13　and　1.5　times　higher　than　those　of　bare　WO3　and　ZnIn2S4,　respectively.　This　provides　valuable　insights　into　the　design　of　muti-functionalized　S-scheme　heterojunction　photocatalysts.　©　2024　Elsevier　Ltd