1. A method for identifying facial features, for executed by an electronic equipment, the method comprising: receiving video data of a plurality of face images and to obtain a real-time background image from the video data by a video tracing technique during a process for displaying the plurality of face images; calculating a video data difference between a current face image and the real-time background image; setting an iteration number according to the video data difference; obtaining facial feature coordinates of a previous face image, the previous one of the current face image, serving as initial facial feature coordinates; and obtaining current facial feature coordinates of the current image, wherein an iterative calculation is conducted according to the iteration number to localize the facial features of the current image based on the initial facial feature coordinates, and the step of calculating the video data comprises: receiving the current face image and the real-time background image that are both subjected to a gray degree treatment; obtaining difference of the current face image and the real-time background image to form a prospective view image; classifying pixels of the foreground image in at least two groups according to different criteria for evaluating the gray degree of the pixels of the foreground image, and giving a weight value to the pixels of the foreground image that are classified within the same group; and obtaining the video data difference by calculating a ratio of a weighted sum of the pixels number to the pixels number of the foreground image.