An antenna system, comprising: a radiating element, a strip line that has a hollow cavity (Olc), and two inner conductors disposed in the hollow cavity, wherein the radiating element is a dual-polarization radiating element, comprising: two radiation baluns, a radiation arm whose polarization direction is positive 45 degrees and a radiation arm whose polarization direction is negative 45 degrees and feeding inner cores, wherein the radiation arms are in one-to-one correspondence with and are connected to the radiation baluns and the feeding inner cores are in one-to-one correspondence with the radiation arms, and wherein the radiation arm whose polarization direction is positive 45 degrees is electrically connected to one of the two inner conductors (Olbl) by a corresponding connected feeding inner core and the radiation arm whose polarization direction is negative 45 degrees is electrically connected to the other one of the two inner 2. conductors (01b2) by a corresponding connected feeding inner core; and an upper wall of the strip line is a strip line ground plane (Ola), and the radiation baluns are fastened on the strip line ground plane (Ola) and are electrically connected to the strip line ground plane; and, wherein the radiation baluns have cavities, and the feeding inner cores are disposed in the cavities of the radiation baluns; the feeding inner cores are fixedly connected to the inner conductors by a first connecting piece; the radiation baluns are fixedly connected to the strip line ground plane (Ola) by a second connecting piece; both the first connecting piece and the second connecting piece are bolts or screws, the second connecting piece is set in the cavities of the radiation baluns. a radiating element, a strip line that has a hollow cavity (Olc), and two inner conductors disposed in the hollow cavity, wherein the radiating element is a dual-polarization radiating element, comprising: two radiation baluns, a radiation arm whose polarization direction is positive 45 degrees and a radiation arm whose polarization direction is negative 45 degrees and feeding inner cores, wherein the radiation arms are in one-to-one correspondence with and are connected to the radiation baluns and the feeding inner cores are in one-to-one correspondence with the radiation arms, and wherein the radiation arm whose polarization direction is positive 45 degrees is electrically connected to one of the two inner conductors (Olbl) by a corresponding connected feeding inner core and the radiation arm whose polarization direction is negative 45 degrees is electrically connected to the other one of the two inner 2. conductors (01b2) by a corresponding connected feeding inner core; and two radiation baluns, a radiation arm whose polarization direction is positive 45 degrees and a radiation arm whose polarization direction is negative 45 degrees and feeding inner cores, wherein the radiation arms are in one-to-one correspondence with and are connected to the radiation baluns and the feeding inner cores are in one-to-one correspondence with the radiation arms, and wherein the radiation arm whose polarization direction is positive 45 degrees is electrically connected to one of the two inner conductors (Olbl) by a corresponding connected feeding inner core and the radiation arm whose polarization direction is negative 45 degrees is electrically connected to the other one of the two inner 2. conductors (01b2) by a corresponding connected feeding inner core; and an upper wall of the strip line is a strip line ground plane (Ola), and the radiation baluns are fastened on the strip line ground plane (Ola) and are electrically connected to the strip line ground plane; and, wherein the radiation baluns have cavities, and the feeding inner cores are disposed in the cavities of the radiation baluns; the feeding inner cores are fixedly connected to the inner conductors by a first connecting piece; the radiation baluns are fixedly connected to the strip line ground plane (Ola) by a second connecting piece; both the first connecting piece and the second connecting piece are bolts or screws, the second connecting piece is set in the cavities of the radiation baluns.