An antenna system for triple-band satellite communication according to one exemplary embodiment of the present disclosure includes a feed horn device that is configured to simultaneously radiate or absorb wireless signals of triple bands including X, Ku and Ka bands, and a waveguide section that is coupled to the feed horn device and configured to transmit input and output of the wireless signals, wherein the feed horn device includes a corrugation horn that is configured to radiate or absorb the wireless signals of the X and Ku bands, the corrugation horn having a bell-like shape with a plurality of corrugations formed on an inner circumferential surface thereof in a stepped manner, and a dielectric feed horn that is configured to radiate or absorb the wireless signal corresponding to the Ku band and disposed in a central region of the corrugation horn.