MXene, the latest 2D transition metal carbides/carbonitrides/nitrides, has exerted a great influence in the fields of physics, chemistry, material science and nanotechnology. It is an important and increasingly popular category for photocatalysis because of the advantages including hydrophilia, visible-light response, high specific surface area and abundant active sites with —OH or —F terminal during preparation. This review provides an overview of the latest progress of MXenes and its composites in the field of photocatalysis research. Firstly, we give a brief introduction of the synthesis, structure and fundamental properties, methodologies of MXenes and emphasize its composites and the corresponding photocatalysis mechanisms. Then we list the important roles in photocatalytic oxidation and reduction it plays, and forecast the development and potential applications of MXenes.