The invention provides an internal fingerprint extraction method, device and system, a storage medium and a fingerprint recognition method. The method comprises the steps of acquiring an optical coherence tomography three-dimensional image of a finger, wherein the three-dimensional image is composed of a plurality of two-dimensional images, each two-dimensional image is composed of a plurality ofscanning lines, and each scanning line comprises a set of interference spectrum data obtained for one scanning point of the finger; for each two-dimensional image, determining an inner fingerprint position in the two-dimensional image; and extracting the inner fingerprint of the finger according to the inner fingerprint position in each two-dimensional image. According to the technical scheme, theinternal fingerprint is automatically detected in the optical coherence tomography three-dimensional image of the finger by utilizing the light reflection characteristic of the internal fingerprint layer, and fingerprint extraction can be quickly and accurately carried out even if the fingertip is not in contact with an acquisition interface during fingerprint acquisition. Therefore, the security, accuracy and robustness of fingerprint identification are greatly improved, and meanwhile, the user experience is improved.