A dual-polarized antenna, wherein: the dual-polarized antenna comprises a ground plate, a feeding part, and a radiant plate, wherein the feeding part is configured to feed an electromagnetic wave signal into the radiant plate and comprises a first feeding part and a second feeding part, the ground plate is disposed at the bottom of the feeding part, and the radiant plate is disposed on the top of the feeding part; the first feeding part comprises a first dielectric plate, a first feeding layer, and a first transmission line, wherein the first feeding layer is disposed on one surface of the first dielectric plate, the first transmission line is disposed on the other surface of the first dielectric plate and a first port is disposed in the first transmission line, and the first port is configured to feed a signal into the first feeding part; the second feeding part comprises a second dielectric plate, a second feeding layer, and a second transmission line, wherein the second feeding layer is disposed on one surface of the second dielectric plate, the second transmission line is disposed on the other surface of the second dielectric plate and a second port is disposed in the second transmission line, and the second port is configured to feed a signal into the second feeding part; and the first dielectric plate and the second dielectric plate are perpendicularly installed on the ground plate, the first dielectric plate and the second dielectric plate are placed perpendicularly to each other, and the first transmission line and the second transmission line are separated from each other; characterised in that a first opening is disposed in the first dielectric plate, the first opening extends from the bottom to the top of the first dielectric plate, a second opening is disposed in the second dielectric plate, the second opening extends from the top to the bottom of the second dielectric plate, and the first dielectric plate and the second dielectric plate are joined by using the first opening and the second opening so as to be placed perpendicularly to each other; wherein a first groove is disposed at the first feeding layer, the first groove extends from the top to the midst of the first feeding layer and comprises a first slot and a second slot connected with the first slot, and the first opening penetrates through the second slot and extends to the first slot; and a second groove is disposed at the second feeding layer, the second groove extends from the top to the midst of the second feeding layer and comprises a third slot and a fourth slot connected with the third slot, and the second opening penetrates into the third slot. the dual-polarized antenna comprises a ground plate, a feeding part, and a radiant plate, wherein the feeding part is configured to feed an electromagnetic wave signal into the radiant plate and comprises a first feeding part and a second feeding part, the ground plate is disposed at the bottom of the feeding part, and the radiant plate is disposed on the top of the feeding part; the first feeding part comprises a first dielectric plate, a first feeding layer, and a first transmission line, wherein the first feeding layer is disposed on one surface of the first dielectric plate, the first transmission line is disposed on the other surface of the first dielectric plate and a first port is disposed in the first transmission line, and the first port is configured to feed a signal into the first feeding part; the second feeding part comprises a second dielectric plate, a second feeding layer, and a second transmission line, wherein the second feeding layer is disposed on one surface of the second dielectric plate, the second transmission line is disposed on the other surface of the second dielectric plate and a second port is disposed in the second transmission line, and the second port is configured to feed a signal into the second feeding part; and the first dielectric plate and the second dielectric plate are perpendicularly installed on the ground plate, the first dielectric plate and the second dielectric plate are placed perpendicularly to each other, and the first transmission line and the second transmission line are separated from each other; characterised in that a first opening is disposed in the first dielectric plate, the first opening extends from the bottom to the top of the first dielectric plate, a second opening is disposed in the second dielectric plate, the second opening extends from the top to the bottom of the second dielectric plate, and the first dielectric plate and the second dielectric plate are joined by using the first opening and the second opening so as to be placed perpendicularly to each other; wherein a first groove is disposed at the first feeding layer, the first groove extends from the top to the midst of the first feeding layer and comprises a first slot and a second slot connected with the first slot, and the first opening penetrates through the second slot and extends to the first slot; and a second groove is disposed at the second feeding layer, the second groove extends from the top to the midst of the second feeding layer and comprises a third slot and a fourth slot connected with the third slot, and the second opening penetrates into the third slot.