Molecular vibration spectrum is an important fingerprint for the identification of material properties and characteristics, which has been widely used to determine molecular structure, identify unknown compounds and analyze hybrid components. A molecular vibration spectroscopy sensor based on the graphene nanoribbon arrays is presented, and validated by numerical simulation. The results show that the transmission bandwidth of the graphene nanoribbon arrays can be flexibly controlled via tuning the chemical potential, period and duty ratio. The transmission coefficient of the sensor is consistent with the corresponding absorption spectrum after deposition of sample substance in the detected zone, which allows for the identification of molecular fingerprint. Moreover, the sensor has good robustness since the envelope of the transmission coefficient is independent on the thickness of the deposited sample substance.