This review discusses the application of MXene-based composite materials in gas sensing. MXene, a two-dimensional material with a layered structure, abundant functional groups, and excellent electrical conductivity, has shown great potential in gas sensing due to its unique properties. Researchers have developed various MXene-based composite materials, including MXene/graphene, MXene/metal oxides, MXene/transition metal sulfides (TMDs), MXene/metal-organic frameworks (MOF), and MXene/polymer, for gas sensing applications. These composites offer improved gas sensing performance, selectivity, and sensitivity compared to pure MXene. The review highlights the preparation methods of gas sensors, the key attributes of MXene related to gas sensing performance, and the gas sensing mechanisms of different MXene-based composites. It also discusses the advantages and disadvantages of various MXene composites and future directions for MXene-based gas sensing. The review emphasizes the importance of MXene-based composites in gas sensing due to their high sensitivity, fast response, and low operating temperature. The review also discusses the challenges in gas sensing, such as poor selectivity and the need for further research to improve the performance of MXene-based composites. Overall, the review provides a comprehensive overview of the current state of MXene-based gas sensing and highlights the potential of MXene-based composites in the field of gas sensing.This review discusses the application of MXene-based composite materials in gas sensing. MXene, a two-dimensional material with a layered structure, abundant functional groups, and excellent electrical conductivity, has shown great potential in gas sensing due to its unique properties. Researchers have developed various MXene-based composite materials, including MXene/graphene, MXene/metal oxides, MXene/transition metal sulfides (TMDs), MXene/metal-organic frameworks (MOF), and MXene/polymer, for gas sensing applications. These composites offer improved gas sensing performance, selectivity, and sensitivity compared to pure MXene. The review highlights the preparation methods of gas sensors, the key attributes of MXene related to gas sensing performance, and the gas sensing mechanisms of different MXene-based composites. It also discusses the advantages and disadvantages of various MXene composites and future directions for MXene-based gas sensing. The review emphasizes the importance of MXene-based composites in gas sensing due to their high sensitivity, fast response, and low operating temperature. The review also discusses the challenges in gas sensing, such as poor selectivity and the need for further research to improve the performance of MXene-based composites. Overall, the review provides a comprehensive overview of the current state of MXene-based gas sensing and highlights the potential of MXene-based composites in the field of gas sensing.