Photocatalysis is a widely known inexperienced and sustainable know-how that may harness inexhaustible photo voltaic vitality to hold out chemical reactions, providing the chance to mitigate environmental points and the vitality disaster. Photocatalysts with huge spectral response and speedy cost switch functionality are essential for extremely environment friendly photocatalytic exercise. Atomically exact steel nanoclusters (NCs), an rising atomic-level materials, have attracted nice pursuits owing to their ultrasmall dimension, distinctive atomic stacking, plentiful floor energetic websites, and quantum confinement impact. Specifically, the molecule-like discrete digital vitality degree endows them with small-band-gap semiconductor habits, which permits for photoexcitation with a purpose to generate electrons and holes to take part within the photoredox response. As well as, steel NCs exhibit robust light-harvesting capacity within the huge spectral UV–close to IR area, and the range of optical absorption properties will be exactly regulated by the composition and construction. These deserves make steel NCs very best candidates for photocatalysis. On this overview, the latest advances in atomically-precise steel NCs for photocatalytic utility are summarized, together with photocatalytic water splitting, CO2 discount, natural transformation, photoelectrocatalytic reactions, N2 fixation and H2O2 manufacturing. As well as, the technique for selling photostability, cost switch and separation effectivity of steel NCs is highlighted. Lastly, a perspective on the challenges and alternatives for NCs-based photocatalysts is offered.