The invention discloses a fingerprint identification method and a fingerprint identification device. The fingerprint identification method comprises the steps of: acquiring a sample fingerprint 1 of a user, and searching a central point 1 of the sample fingerprint 1; emitting a plurality of rays evenly to the surrounding from the central point 1, acquiring values of each ray and fingerprint lines to obtain a plurality of matrixes A, calculating a distance matrix B of the adjacent fingerprint lines according to the plurality of matrixes A, and calculating a ratio matrix C according to elements of the distance matrix B; acquiring a to-be-identified fingerprint 2, connecting points at two side edges of the fingerprint 2 through straight lines to obtain an intersection point of the two straight lines, regarding the intersection point as a central point 2; and regarding the central point 2 as an end point of rays between the two straight lines, emitting a plurality of rays evenly, acquiring values of each ray and fingerprint lines to obtain a plurality of matrixes D, calculating a distance matrix E of the adjacent fingerprint lines according to the plurality of matrixes D, and calculating a ratio matrix F according to elements of the distance matrix E; and determining that the fingerprint 2 assembles the fingerprint 1 if C-F