Large-scale　photochemical　synthesis　of　high　value　chemicals　under　mild　conditions　is　an　ideal　method　of　green　chemical　production.　However,　a scalable　photocatalytic　process　has　been　barely　reported　due　to　the　costly　preparation,　low　stability　of　photosensitizers　and　critical　reaction　conditions　required　for　classical　photocatalysts.　Here,　we　report　the　merging　of　flow　chemistry　with　heterogeneous　photoredox　catalysis　for　the　facile　production　of　high　value　compounds　in　a　continuous　flow　reactor　with　visible　light　at　room　temperature　in　air.　In　the　flow　reactor　system,　polymeric　carbon　nitrides, which　are　cheap,　sustainable　and　stable　heterogeneous　photocatalysts,　are　immobilized　onto　glass　beads　and　fibers,　demonstrating　a　highly　flexible　construction　possibility　for　devices　of　the　photocatalytic　materials.　As　an example　of　the　production　of　high　value　chemicals,　important　chemical　structures　such as　cyclobutanes,　which　are　basic　building　blocks　for　many　pharmaceutical　compounds,　like　magnosalin,　are　synthesized　in　flow　with　high　catalytic　efficiency　and　stability.　©　2020,　The　Author(s).