Detection device for circumferential weld in pipeline

The utility model discloses a device for detecting a circumferential weld in a pipeline. The device comprises a supporting assembly, a rotating assembly and an X-ray machine, the supporting assembly is arranged on the ground; the rotating assembly comprises an outer disc, an inner disc and a rotating shaft which are coaxially arranged, as well as a positioning pin and a connecting rod; the outer disc is connected to the supporting assembly. The inner disc and the outer disc are pivoted and matched and are connected to the end part of the rotating shaft; the outer disc and the inner disc are both provided with a plurality of positioning holes, and the positioning pins penetrate into the positioning holes of the outer disc and the inner disc at the same time so that the outer disc and the inner disc can be relatively fixed. The connecting rod is connected to the rotating shaft and penetrates through the rotating shaft in the radial direction of the rotating shaft. And the X-ray machine is connected to the end p