The　development　of　hydrogen　sensors　with　high　detection　accuracy,　fast　response　times,　long　calibration　periods,　and　good　stability　has　become　the　focus　of　the　space　station　environmental　control　and　life　support　subsystem.　We　analyze　the　current　research　status　of　different　types　of　hydrogen　sensors,　including　catalyst　combustion　type,　heat　conduction　type,　semiconductor　type,　fiber　optic　type,　etc.　The　response　signals　of　most　hydrogen　sensors　are　affected　by　temperature　and　humidity,　resulting　in　cross-sensitivity.　Reducing　the　cross-sensitivity　of　temperature,　humidity,　and　other　interfering　factors　to　achieve　accurate　hydrogen　measurement　in　different　environments　is　a　challenge　that　limits　the　development　of　hydrogen　sensors.　Several　hydrogen　sensors　that　are　currently　commercially　available　have　a　narrow　operating　temperature　range,　most　of　them　can　only　measure　at　room　temperature,　and　high-temperature　environments　require　a　higher　accuracy　and　lifetime　of　the　sensor　than　required　at　room　temperature.　Many　new　hydrogen-sensitive　materials　were　developed　to　improve　the　performance　of　the　sensors.　The　excellent　performance　of　fiber-optic　hydrogen　sensors　is　beneficial　to　temperature　compensation　and　distributed　multiparameter　measurement,　as　well　as　to　the　research　and　development　of　intelligent　sensing　systems,　in　the　context　of　the　Internet　of　Things.　The　signal　detection　and　demodulation　techniques　of　fiber-optic　sensors　are　the　focus　of　future　hydrogen　sensor　research.