The invention discloses a dome type fixed-focus automatic tracking device which comprises brackets, a first rotating disc, a second rotating disc, an arc-shaped rack and a lens, wherein the first rotating disc as well as the second rotating disc can be mounted at two ends of the corresponding bracket in a swinging way; two ends of the arc-shaped rack are fixedly mounted on the first rotating disc and the second rotating disc respectively; and the lens is mounted on the arc-shaped rack in a sliding way. The invention further provides a manufacturing method which comprises the following steps: 1) determining the orbit radius of the arc-shaped rack according to the size of the lens; 2) determining the angle of the arc-shaped rack according to the sunshine duration at the place where the dome type fixed-focus automatic tracking device is used; 3) determining the radiuses of the first rotating disc and the second rotating disc; and 4) mounting all the parts, of which the sizes are determined, on the brackets to finish assembly. The dome type fixed-focus automatic tracking device has the beneficial effects of simple structure, small size, high solar energy utilization ratio and low manufacturing cost.