Detection mechanism for detecting sealing performance of pipeline

The utility model relates to the technical field of pipeline air tightness detection equipment, in particular to a detection mechanism used for detecting the sealing performance of a pipeline, the detection mechanism comprises two positioning mechanisms which are oppositely distributed and used for sealing and positioning the end part of the pipeline, each positioning mechanism comprises a rack, a positioning assembly and a sealing and plugging assembly, the sealing and plugging assembly comprises a linear telescopic assembly, plugging blocks and a rubber sheet, the linear telescopic assembly is horizontally installed on the rack, the plugging blocks are installed at the telescopic ends of the linear telescopic assembly, one of the plugging blocks is of a cavity structure, and an exhaust port is formed in the center of the front face of the plugging block; the pipeline air tightness detection device is simple in structure, the air tightness of the pipeline can be rapidly and accurately detected by sealing and