A dual-polarized antenna, comprising an H-plane horn antenna and a planar end-fire antenna, wherein the dual-polarized antenna is a planar antenna, a polarization direction of the H-plane horn antenna is perpendicular to an antenna plane of the dual-polarized antenna, a polarization direction of the planar end-fire antenna is parallel to the antenna plane, the polarization direction of the H-plane horn antenna is perpendicular to the polarization direction of the planar end-fire antenna, a maximum radiation direction of the dual-polarized antenna is parallel to the antenna plane, and the maximum radiation direction of the dual-polarized antenna is perpendicular to the polarization direction of the H-plane horn antenna and the polarization direction of the planar end-fire antenna; wherein the H-plane horn antenna comprises a first feeding part, a metal via hole array, a first metal floor, and a second metal floor, wherein the metal via hole array comprises a first metal via hole array and a second metal via hole array, and the first metal floor and the second metal floor are parallel to the antenna plane; the first metal floor is parallel to the second metal floor, and the metal via hole array is located between the first metal floor and the second metal floor; a top end of each metal via hole in the metal via hole array is electrically connected to the first metal floor, and a bottom end of each metal via hole is connected to the second metal floor; the first metal via hole array and the second metal via hole array are perpendicular to the first metal floor and the second metal floor; and the first metal floor, the second metal floor, and the metal via hole array form a waveguide cavity, and the first feeding part is configured to feed the waveguide cavity, wherein the first metal via hole array and the second metal via hole array are used as two side walls of the waveguide cavity, the first metal floor is used as a top surface of the waveguide cavity, and the second metal floor is used as a bottom surface of the waveguide cavity; and the planar end-fire antenna comprises a second feeding part and a radiation patch, wherein the second feeding part is configured to feed the radiation patch, and the radiation patch is parallel to the first metal floor and the second metal floor. the dual-polarized antenna is a planar antenna, a polarization direction of the H-plane horn antenna is perpendicular to an antenna plane of the dual-polarized antenna, a polarization direction of the planar end-fire antenna is parallel to the antenna plane, the polarization direction of the H-plane horn antenna is perpendicular to the polarization direction of the planar end-fire antenna, a maximum radiation direction of the dual-polarized antenna is parallel to the antenna plane, and the maximum radiation direction of the dual-polarized antenna is perpendicular to the polarization direction of the H-plane horn antenna and the polarization direction of the planar end-fire antenna; wherein the H-plane horn antenna comprises a first feeding part, a metal via hole array, a first metal floor, and a second metal floor, wherein the metal via hole array comprises a first metal via hole array and a second metal via hole array, and the first metal floor and the second metal floor are parallel to the antenna plane; the first metal floor is parallel to the second metal floor, and the metal via hole array is located between the first metal floor and the second metal floor; a top end of each metal via hole in the metal via hole array is electrically connected to the first metal floor, and a bottom end of each metal via hole is connected to the second metal floor; the first metal via hole array and the second metal via hole array are perpendicular to the first metal floor and the second metal floor; and the first metal floor, the second metal floor, and the metal via hole array form a waveguide cavity, and the first feeding part is configured to feed the waveguide cavity, wherein the first metal via hole array and the second metal via hole array are used as two side walls of the waveguide cavity, the first metal floor is used as a top surface of the waveguide cavity, and the second metal floor is used as a bottom surface of the waveguide cavity; and the planar end-fire antenna comprises a second feeding part and a radiation patch, wherein the second feeding part is configured to feed the radiation patch, and the radiation patch is parallel to the first metal floor and the second metal floor.