Sealing device for low-pressure pressure test in pipeline

The utility model relates to the technical field of pipeline detection, in particular to a sealing device for a medium-low pressure test of a pipeline, which comprises a pipe cap, a hoop, a sealing ring and a fastener, the pipe cap is a cup body with an annular groove in the outer surface; the hoop comprises two semi-circular steel rings with U-shaped cross sections, bent edges are arranged at the two tail ends of each semi-circular steel ring, through holes are formed in the bent edges, and the fasteners penetrate through the through holes to fixedly connect the two semi-circular steel rings to form a circular steel ring. The circular steel ring is arranged in the annular groove of the pipe cap in a sleeving manner; and the sealing ring is arranged on the inner side of the circular steel ring. And the equipment connecting pipe is connected with the test pipe cap through the hoop and the sealing ring to form a reliable sealing flange structure. And after the pressure test is finished, the fastener is directly