The invention provides an air-cooling window target. The window target comprises a proton rail which is arranged vertically, wherein a rail inlet is formed in the upper end of the proton rail, and a semi-spherical target window is arranged at the lower end of the proton rail; an inner sleeve sleeves outside the proton rail; the upper end of the proton rail is fixedly connected with the upper end of the inner sleeve; an outlet is formed in the side wall, close to the upper end of the inner sleeve, of the inner sleeve, and is provided with a first valve; a spallation target part is arranged in the inner sleeve under the proton rail; an opening is formed in the lower end of the inner sleeve; an outer sleeve sleeves outside the inner sleeve; the upper end of the outer sleeve is fixedly connected with the inner sleeve; the lower end of the outer sleeve is sealed; an inlet is formed in the side wall, close to the upper end of the outer cylinder, of the outer cylinder, and is provided with a second valve; and the opening is used for communicating the outer sleeve and the inner sleeve to form a cooling loop. The air-cooling window target adopts the design of a target window structure, can be used for effectively blocking nuclide generated after bombarding to ensure the vacuum degree of the proton accelerated rail, adopts a sealing design and the air-cooling loop, and has a simple structure to ensure the equipment safety.