An antenna assembly, comprising: a metal main body, wherein the metal main body is in a form of plate, the metal main body comprises a first end, a second end opposite to the first end, a third end, and a fourth end opposite to the third end; a first metal connecting part and a second metal connecting part, wherein the first metal connecting part and the second metal connecting part are respectively connected to the third end and the fourth end; a first radiating element, a second radiating element, a third radiating element and a fourth radiating element, wherein the first radiating element, the second radiating element, the third radiating element and the fourth radiating element each are spaced from the metal main body, the first radiating element and the second radiating element are respectively connected to two ends of the first metal connecting part towards the first end and towards the second end, the third radiating element and the fourth radiating element are respectively disposed on two ends of the second metal connecting part towards the first end and towards the second end; and a fifth radiating element, a sixth radiating element, a seventh radiating element, and an eighth radiating element, wherein the fifth radiating element, the sixth radiating element, the seventh radiating element, and the eighth radiating element each are spaced from the metal main body, the fifth radiating element and the sixth radiating element are disposed on the second end, the seventh radiating element is disposed on the first end, and the eighth radiating element is disposed on the first end or the second end; characterized in that the antenna assembly is configured to be operated as an 8×8 5G MIMO antenna system, and the antenna assembly further comprises a plurality of frequency band switching modules, wherein the first radiating element, the second radiating element, the third radiating element, the fourth radiating element, the fifth radiating element, the sixth radiating element, the seventh radiating element, and the eighth radiating element are respectively connected to the ground through at least one of the plurality of frequency band switching modules. a metal main body, wherein the metal main body is in a form of plate, the metal main body comprises a first end, a second end opposite to the first end, a third end, and a fourth end opposite to the third end; a first metal connecting part and a second metal connecting part, wherein the first metal connecting part and the second metal connecting part are respectively connected to the third end and the fourth end; a first radiating element, a second radiating element, a third radiating element and a fourth radiating element, wherein the first radiating element, the second radiating element, the third radiating element and the fourth radiating element each are spaced from the metal main body, the first radiating element and the second radiating element are respectively connected to two ends of the first metal connecting part towards the first end and towards the second end, the third radiating element and the fourth radiating element are respectively disposed on two ends of the second metal connecting part towards the first end and towards the second end; and a fifth radiating element, a sixth radiating element, a seventh radiating element, and an eighth radiating element, wherein the fifth radiating element, the sixth radiating element, the seventh radiating element, and the eighth radiating element each are spaced from the metal main body, the fifth radiating element and the sixth radiating element are disposed on the second end, the seventh radiating element is disposed on the first end, and the eighth radiating element is disposed on the first end or the second end; characterized in that the antenna assembly is configured to be operated as an 8×8 5G MIMO antenna system, and the antenna assembly further comprises a plurality of frequency band switching modules, wherein the first radiating element, the second radiating element, the third radiating element, the fourth radiating element, the fifth radiating element, the sixth radiating element, the seventh radiating element, and the eighth radiating element are respectively connected to the ground through at least one of the plurality of frequency band switching modules.