A connector is characterized by comprising a T-shaped main body, three connecting components and two connecting tubes, wherein the connecting components are arranged on one surface of the main body and located at three endpoints of the T-shaped main body. Each connecting component comprises a concave groove body and a connecting column which is arranged in a cavity of the concave groove body, wherein a gap exists between the connecting column and the inner wall of the concave groove body. The two connecting tubes are arranged between two connecting components at the bottom of the T-shaped main body side by side. Each connecting tube penetrates through the main body. Connecting holes are formed in the other surface of the main body.