Graphene　quantum　dots　(GQDs),　as　a　unique　category　of　zero-dimensional　(0D)　carbon　nanomaterial,　has　ignited　tremendous　interest　in　the　past　few　years　owing　to　its　gorgeous　electronic　and　physicochemical　properties　in　conjunction　with　quantum-confinement　and　edge　effects.　In　this　review　article,　we　predominantly　focus　on　the　recent　developments　of　GQDs-semiconductor　composited　systems　for　heterogeneous　photocatalysis　and　photo-electrocatalysis　under　ambient　conditions　including　non-selective　pollutant　degradation,　selective　organic　transformation,　hydrogen　or　oxygen　production,　CO2　reduction,　and　photoelectrochemical　(PEC)　water　splitting.　It　is　anticipated　that　our　current　review　article　will　provide　enriched　information　on　the　promising　applications　of　GQDs　and　its　derivatives　and　simultaneously,　offer　new　insights　for　exploring　a　large　variety　of　GQDs-semiconductor　composited　systems　for　advanced　solar　energy　conversion.