In order to solve the problem that the portable eye tracker is susceptible to the external environment and the changes of the physiological and psychological state of user, a compact sclera angiography device for eye movement tracking is proposed. The imaging device consists of a main lens, a microlens array, and an imaging detector, whose focal length of the main lens is equal to the distance from the surface of the eye to the main lens, and the imaging detector is located at one focal length of the microlens array. In order to further reduce the volume of the whole imaging device, a rectangular prism is used to turn the optical path twice, which is the imaging object, the main lens, the rectangular prism, the reflective surface 1, the reflective surface 2, the microlens array, and the imaging detector in order of the optical path. The results show that the device can achieve a clear image of scleral vessels at close range based on microlens array, and can obtain a multi-aperture image array of scleral vessels, which has the characteristics of small size, large depth of field and high resolution.