In　recent　years,　tungsten　oxide　(WO3)　has　attracted　enormous　attention　owing　to　its　unique　structural　and　optical　properties;　nonetheless,　slow　charge　transfer,　sluggish　kinetics　of　holes,　and　rapid　electron-hole　recombination　markedly　retard　its　wide-spread　applications　in　photocatalysis.　Herein,　variable　WO3　superstructures　were　constructed　with　their　architectures　finely　tuned　by　organic　acids,　based　on　which　hierarchical　g-C3N4　enwrapped　WO3　superstructures　were　constructed　by　an　in　situ　self-assembly　strategy.　A　collection　of　combined　structural　and　morphological　characterizations　manifested　that　WO3　and　g-C3N4　ingredients　were　intimately　integrated　forming　well-defined　photoredox　systems.　We　found　that　these　closely　assembled　g-C3N4/WO3　heterostructures　exhibited　highly　efficient　and　versatile　photoredox　performances　including　photo-oxidation　of　diverse　organic　pollutants　and　selective　photo-reduction　of　a　series　of　aromatic　nitro　compounds　under　visible　light　irradiation　and　remarkably　outperformed　their　corresponding　single　WO3　and　g-C3N4　counterparts　by　virtue　of　cooperative　synergy.　An　elegant　Z-scheme　dominated　photoredox　catalytic　mechanism　was　unambiguously　determined　by　probing　the　in　situ　formed　active　species　(e.g.,　hydroxyl　radicals,　superoxide　radicals,　and　hydrogen　peroxide)　responsible　for　the　significantly　enhanced　photoredox　performances　of　g-C3N4/WO3　heterostructures.　It　is　anticipated　that　our　work　could　provide　a　straightforward　paradigm　to　rationally　fabricate　WO3　superstructures　and　judiciously　construct　a　large　variety　of　Z-scheme　based　photocatalysts.　©　2017　The　Royal　Society　of　Chemistry.