The present invention provides a face identification method in a video and a face identification device in the video. The face identification method in the video comprises the steps of carrying out the feature extraction on the target faces in multiple frames of images of the video to generate a plurality of feature vectors corresponding to the target faces in the multiple frames of images respectively; carrying out the timing sequence feature extraction on the plurality of feature vectors to transform the plurality of feature vectors into a feature vector of a predetermined dimension; utilizing a classifier to judge the feature vector of the predetermined dimension to identify the target faces. The face identification method and device in the video adopts a dynamic identification mode, and the information of the frames of images are complemented by utilizing the feature that the frames of images in the video have relevance on a time dimension, thereby improving the face identification accuracy.