Sight tracking method and sight tracking device

The invention provides a sight tracking method and a sight tracking device. The sight tracking device comprises a video acquiring module, a head video processing module, an eye video processing module and a sight direction calculating module, wherein the video acquiring module is used for obtaining an image of the head part of a user, and the image is used as an input image; the head video processing module is used for tracking facial key points according to the input image; the eye video processing module is used for positioning a pupil center and an eyeball center according to the tracked facial key points so as to determine a three-dimensional coordinate of the pupil center and a three-dimensional coordinate of the eyeball center; and the sight direction calculating module is used for calculating a sight direction of a user by using the three-dimensional coordinate of the pupil center and the three-dimensional coordinate of the eyeball center.