An antenna system, comprising: a dual-polarization radiating element, and a strip line; the dual-polarization radiating element comprises: a radiation balun, a first radiation arm (00a1) with a polarization direction of positive 45 degrees, a second radiation arm (00a2) with a polarization direction of negative 45 degrees, a first feeding inner core (00b1), and a second feeding inner core (00b2), wherein the first radiation arm (00a1) and the second radiation arm (00a2)are fastened on the radiation balun, the first radiation arm (00a1) corresponds to the first feeding inner core (00b1), the second radiation arm (00a2) corresponds to the second feeding inner core (00b2); the strip line comprises: a strip line ground plane (01a1,01a2), a hollow cavity, a first inner conductor (Olbl) disposed in the hollow cavity, and a second inner conductor (01b2) disposed in the hollow cavity; the first radiation arm (00a1) is electrically connected to the first inner conductor (Olbl) by the first feeding inner core (00b1), the second radiation arm (00a2) is electrically connected to the second inner conductor (01b2) by the second feeding inner core (00b2), wherein the balun has a bottom surface which contacts the strip line ground plane (01a1,01a2), and the bottom surface of the radiation balun is fastened on the strip line ground plane (01a1, 01a2) by one first connecting piece; wherein the strip line ground plane (01a1,01a2) comprises a first strip line ground plane (01a1), and a second strip line ground plane (01a2); the hollow cavity is divided into a first hollow cavity (01c1) and a second hollow cavity (01c2); the first inner conductor (Olbl) is located in the first hollow cavity (01c1), an upper sidewall of the first hollow cavity (01c1) is the first strip line ground plane (01a1); the second inner conductor (01b2) is located in the second hollow cavity (01c2), an upper sidewall of the second hollow cavity (01c2) is the second strip line ground plane (01a2); and wherein the first connecting piece is located between the first strip line ground plane (01a1) and the second strip line ground plane (01a2). a dual-polarization radiating element, and a strip line; the dual-polarization radiating element comprises: a radiation balun, a first radiation arm (00a1) with a polarization direction of positive 45 degrees, a second radiation arm (00a2) with a polarization direction of negative 45 degrees, a first feeding inner core (00b1), and a second feeding inner core (00b2), wherein the first radiation arm (00a1) and the second radiation arm (00a2)are fastened on the radiation balun, the first radiation arm (00a1) corresponds to the first feeding inner core (00b1), the second radiation arm (00a2) corresponds to the second feeding inner core (00b2); the strip line comprises: a strip line ground plane (01a1,01a2), a hollow cavity, a first inner conductor (Olbl) disposed in the hollow cavity, and a second inner conductor (01b2) disposed in the hollow cavity; the first radiation arm (00a1) is electrically connected to the first inner conductor (Olbl) by the first feeding inner core (00b1), the second radiation arm (00a2) is electrically connected to the second inner conductor (01b2) by the second feeding inner core (00b2), wherein the balun has a bottom surface which contacts the strip line ground plane (01a1,01a2), and the bottom surface of the radiation balun is fastened on the strip line ground plane (01a1, 01a2) by one first connecting piece; wherein the strip line ground plane (01a1,01a2) comprises a first strip line ground plane (01a1), and a second strip line ground plane (01a2); the hollow cavity is divided into a first hollow cavity (01c1) and a second hollow cavity (01c2); the first inner conductor (Olbl) is located in the first hollow cavity (01c1), an upper sidewall of the first hollow cavity (01c1) is the first strip line ground plane (01a1); the second inner conductor (01b2) is located in the second hollow cavity (01c2), an upper sidewall of the second hollow cavity (01c2) is the second strip line ground plane (01a2); and wherein the first connecting piece is located between the first strip line ground plane (01a1) and the second strip line ground plane (01a2).