Direct allylic C-H thiolation is straightforward for allylic C(sp )-S bond formation. However, strong interactions between thiol and transition metal catalysts lead to deactivation of the catalytic cycle or oxidation of sulfur atom under oxidative condition. Thus, direct allylic C(sp )-H thiolation has proved difficult. Represented herein is an exceptional for direct, efficient, atom- and step-economic thiolation of allylic C(sp )-H and thiol S-H under visible light irradiation. Radical trapping experiments and electron paramagnetic resonance (EPR) spectroscopy identified the allylic radical and thiyl radical generated on the surface of photocatalyst quantum dots (QDs). The C-S bond formation does not require external oxidants and radical initiators, and hydrogen (H ) is produced as byproduct. When vinylic C(sp )-H was used instead of allylic C(sp )-H bond, the radical-radical cross-coupling of C(sp )-H and S-H was achieved with liberation of H . Such a unique transformation opens up a door toward direct C-H and S-H coupling for valuable organosulfur chemistry.