The utility model is suitable for a sensor technology field provides a micro -nanofiber michelson interferometer formula hydrogen sensor, including the broadband light source unit for the broad -bandlight that the width was preset in the production erupts simultaneously and gives the coupling unit, it is right that the coupling unit is used for broad -band light carries out the beam splitting, obtain sensor detection light with the beam splitting and send for the sensing light path, and the reference light that obtains the beam splitting sends for reference light path, the sensing light pathis used for reflecting sensor detection light, obtains the sensor detection reverberation with the reflection and sends for the coupling unit, reference light path is used for reflecting the referencelight, is referred to the reflection to the reverberation and sends for the coupling unit, the coupling unit still is used for closing with the reference reverberation the sensor detection reverberation to be restrainted, will close bundle interference light that obtains and send for the demodulation unit, the demodulation unit is used for detecting and the demodulation the interference light, obtains interference spectrum. The embodiment of the utility model provides a sensor preparation is simple, the machining reproducibility is good.