Abstract: Hydrogen, as a high energy density and clean energy carrier, is important in alleviating the shortage of traditional fossil fuels and environmental pollution. However, during the production, storage and transportation of hydrogen, it is easy to react with metals, inducing hydrogen embrittlement, which can lead to hydrogen leakage and safety accidents. Therefore, in order to ensure the safe application of hydrogen in various processes, there is an urgent need to realize timely and accurate early warning of hydrogen leakage. The development of hydrogen sensors with high sensitivity, fast response, high selectivity and excellent stability is the key to ensure the safety of hydrogen use. This paper summarizes the working principle, performance characteristics and technical development of several types of common hydrogen sensors, systematically summarizes the advantages and problems of various types of sensors, and looks forward to the future development trend of hydrogen sensors. It focuses on the research progress of new sensitive materials and micro-nano manufacturing technology in enhancing the performance of sensors, and at the same time puts forward thoughts on the development direction of intelligent and miniaturized hydrogen sensors.