Atomically　precise　metal　nanoclusters　(NCs)　demonstrate　the　unprecedented　merits　including　unique　atomic　stacking　pattern,　quantum　confinement　effect,　abundant　active　sites,　and　discrete　energy　band　structure,　filling　the　gap　between　single　atoms　and　conventional　metal　nanocrystals.　Integrating　two　metals　into　one　nanocluster　unit　to　craft　bimetallic　NCs　(BNCs)　significantly　endow　metal　NCs　with　fascinating　physicochemical　properties,　electronic　structures,　and　metal-ligand　interaction　mechanisms　through　the　bimetallic　cooperative　synergy.　Nevertheless,　there　has　still　been　a　lack　of　comprehensive,　insightful　and　timely　overview　on　BNCs-based　photoredox　catalysis.　Herein,　this　review　recaps　the　category,　synthetic　strategies　and　characterization　methods　of　a　new　generation　of　atomically　precise　BNCs,　along　with　their　recent　exciting　cutting-edge　progress　in　diverse　photoredox　catalysis,　including　photocatalytic　hydrogen　production,　CO2　reduction,　selective　organic　transformation　and　environmental　remediation.　The　charge　transfer　mechanisms　and　insight　into　structure-activity　correlation　in　different　redox　catalysis　reactions　are　elucidated.　Eventually,　future　prospects　and　challenging　tasks　in　this　booming　research　field　are　discussed.　The　current　review　is　expected　to　timely　provide　an　emerging　roadmap　for　customizing　novel　BNCs　as　a　versatile　photocatalyst　platform　toward　solar　energy　conversion.　©　2025　Wiley-VCH　GmbH.