A fingerprint information dynamic updating method, comprising: collecting fingerprint image information of a part of the fingerprint and performing fingerprint recognition according to the collected fingerprint image information and a pre-registered fingerprint image template database; after the fingerprint recognition succeeds, determining whether the fingerprint image template database is saturated; if the fingerprint image template database is not saturated and the collected fingerprint imageinformation satisfies a first updating condition, adding the collected fingerprint image information to the fingerprint image template database; and if the fingerprint image template database is saturated and the collected fingerprint image information satisfies a second updating condition, selecting a target fingerprint image information from the fingerprint image template database and replacing the target fingerprint image information with the collected fingerprint image information; wherein the first updating condition is that new image information exists in the collected fingerprint image information as compared with fingerprint image information in the fingerprint image template database. the second updating condition is that new image information exists in the collected fingerprint image information as compared with fingerprint image information in the fingerprint image template database, and the amount of the new image information reaches a second threshold; and the target fingerprint image information is the fingerprint image information in the fingerprint image template database, that has the most redundancy information and of which the amount of new image information as compared with fingerprint image information in the fingerprint image template database added by the target fingerprint image information is less than the amount of new image information as compared with fingerprint image information in the fingerprint image template database added by the collected fingerprint image information; and having the most redundancy information consists in having the greatest amount of repeated imae information, or the least amount of new image information in the fingerprint image template database. collecting fingerprint image information of a part of the fingerprint and performing fingerprint recognition according to the collected fingerprint image information and a pre-registered fingerprint image template database; after the fingerprint recognition succeeds, determining whether the fingerprint image template database is saturated; if the fingerprint image template database is not saturated and the collected fingerprint imageinformation satisfies a first updating condition, adding the collected fingerprint image information to the fingerprint image template database; and if the fingerprint image template database is saturated and the collected fingerprint image information satisfies a second updating condition, selecting a target fingerprint image information from the fingerprint image template database and replacing the target fingerprint image information with the collected fingerprint image information; wherein the first updating condition is that new image information exists in the collected fingerprint image information as compared with fingerprint image information in the fingerprint image template database. the second updating condition is that new image information exists in the collected fingerprint image information as compared with fingerprint image information in the fingerprint image template database, and the amount of the new image information reaches a second threshold; and the target fingerprint image information is the fingerprint image information in the fingerprint image template database, that has the most redundancy information and of which the amount of new image information as compared with fingerprint image information in the fingerprint image template database added by the target fingerprint image information is less than the amount of new image information as compared with fingerprint image information in the fingerprint image template database added by the collected fingerprint image information; and having the most redundancy information consists in having the greatest amount of repeated imae information, or the least amount of new image information in the fingerprint image template database.