Device identifies fingerprint, comprising: fingerprint sensor The fingerprint sensor that preset range is arranged at least two water content detection electrodes Processing module is coupled to fingerprint sensor and at least two water content detection electrodes. Fingerprint sensor sends processing module to for exporting a fingerprint signal, when users touch fingerprint sensor and at least two water content detection electrodes and finger. The processing module is configured to obtain characteristic value, is positively correlated and impedance is at least two water content detection electrodes, when users touch fingerprint sensor and at least two water content detection electrodes and finger Determine matching fingerprint parameter characteristic value Fingerprint recognition is carried out, according to the fingerprint signal of determining parameter and fingerprint recognition.
