Wide-field optical coherence tomography (WF-OCT) is a new direction in the field of optical coherence tomography. It receives interference signals to obtain two-dimensional information of the sample, and establishes the image of the whole section of the sample at one time, so as to obtain the image information of the sample quickly and efficiently, and to realize the research on the characteristics of the object. In this paper, the basic principle, basic structure and characteristics of WF-OCT system, and its applications in ophthalmology in recent years are summarized, which can provide ideas and reference for the instrument design of WF-OCT and its ophthalmic applications.