MXenes is a two-dimensional nanomaterial with a unique layered structure, its prominent characteristics include mechanical stability, thermodynamic stability, high ratio surface area, biocompatibility, a large number of functional groups, easy functionalization, antibacterial properties, high conductivity , hydrophilicity and special optical properties and so on. Based on these features, MXenes and their composite materials have a wide concern in the environmental field. Through the literature research method, characteristics of MXenes and their composites are studied in environmental sectors include seawater desalination, remove heavy metals, remove radioactive elements, degrade organic pollutants, etc., especially in solving cleaning energy problems, it also shows huge potential.