1. A face recognition system, comprising: a storage module, arranged for storing a plurality of face recognition codes, a plurality of face images corresponding to the plurality of face recognition codes, or face coordinates in the plurality of face images; a processing module, arranged for calculating an overlap rate of a (T−1) th face image that overlaps a T th face image in the plurality of face images, and wherein when the processing module determines that the overlap rate is greater than a first preset value, the processing module calculates a similarity between the (T−1) th face image and the T th face image, and if the similarity is smaller than a second preset value, the processing module retains the face recognition code of the (T−1) th face image; and a display module, arranged for displaying the corresponding face recognition code in the T th face image; wherein, T is a positive integer greater than zero.