The invention provides an air cooled refrigerator and a manufacturing method thereof. The air cooled refrigerator comprises a refrigerator body; the refrigerator body comprises an inner tank, at least one fixing device and an air duct device, wherein the inner tank is provided with a inner tank wall, and at least one mounting hole is formed in the inner tank wall; each fixing device is mounted to one mounting hole from the outer side of the inner tank; and the air duct device is mounted to the fixing devices from the inner side of the inner tank, contacts with and abuts against the inner side surface of the inner tank wall, and is configured to transport gas into the inner tank and/or receive gas in the inner tank. Because the mounting holes can be opened in the inner tank, the air duct device can be fixed through the fixing devices whose main parts are arranged on the outer side of the inner tank, special-shaped pits do not need to be made in the inner tank, and the universal property of the inner tank is facilitated.