The invention discloses a cable outer conductor weldment, which comprises a feed connection body and a cable welding arm, wherein the bottom part of the feed connection body is provided with an outwardly-convex connection part connected with a reflection plate; the cable welding arm comprises a buffer part, an arc transition part and a welding part, and one end of the buffer part is connected with the feed connection body and the other end is connected with the welding part through the arc transition part; the welding part is provided with an inwardly-concave arc surface for connecting the cable outer conductor; the arc transition part is U-shaped; and the U-shaped opening and the inwardly-concave arc surface of the welding part face the opposite directions. Correspondingly, the invention also discloses an antenna comprising the above cable outer conductor weldment. The cable outer conductor weldment has a compact structure, the grounding performance is good, and stable parameters such as standing wave, isolation, and three-order intermodulation are provided for the antenna.