MXene, a two-dimensional material with a layered structure, abundant functional groups, and excellent electrical conductivity, has gained significant attention in gas sensing applications. This review highlights the recent progress in the development of MXene-based composite materials for gas sensing, focusing on their preparation methods, key attributes, and performance in various gas sensing applications. The article discusses the advantages and challenges of MXene-based composites, such as MXene/graphene, MXene/metal oxides, MXene/transition metal sulfides (TMDs), MXene/metal-organic frameworks (MOFs), and MXene/polymer composites. These composites offer enhanced gas sensing performance due to the improved adsorption sites, defects, and modulation of working functions provided by the composite materials. The review also covers the preparation technologies for gas sensors, including coating, printing, spinning, and transfer techniques, and their impact on the performance and production efficiency of gas sensors. Additionally, the structural and properties of MXene are discussed, emphasizing its unique hexagonal lattice structure and surface functional groups, which contribute to its excellent gas sensing capabilities. The article concludes by systematically discussing the advantages and challenges of MXene-based composites in gas sensing, providing insights into their potential for advanced sensor research and applications.MXene, a two-dimensional material with a layered structure, abundant functional groups, and excellent electrical conductivity, has gained significant attention in gas sensing applications. This review highlights the recent progress in the development of MXene-based composite materials for gas sensing, focusing on their preparation methods, key attributes, and performance in various gas sensing applications. The article discusses the advantages and challenges of MXene-based composites, such as MXene/graphene, MXene/metal oxides, MXene/transition metal sulfides (TMDs), MXene/metal-organic frameworks (MOFs), and MXene/polymer composites. These composites offer enhanced gas sensing performance due to the improved adsorption sites, defects, and modulation of working functions provided by the composite materials. The review also covers the preparation technologies for gas sensors, including coating, printing, spinning, and transfer techniques, and their impact on the performance and production efficiency of gas sensors. Additionally, the structural and properties of MXene are discussed, emphasizing its unique hexagonal lattice structure and surface functional groups, which contribute to its excellent gas sensing capabilities. The article concludes by systematically discussing the advantages and challenges of MXene-based composites in gas sensing, providing insights into their potential for advanced sensor research and applications.