Pipeline leak tester

The utility model discloses a pipeline leak tester; a pipe orifice of the pipeline is provided with a spigot; the leak tester comprises a sealing cover; a center of the sealing cover is provided with a slot used for containing the pipe orifice of the pipeline; a side wall of the slot is symmetrically provided with a plurality of first thread holes; a first screw is arranged in the first thread hole; a bottom of the first screw abuts against an outer surface of the pipeline close to the spigot; the tester also comprises a sealing pressure plate clamped between a bottom of the slot and the pipe orifice; the sealing pressure plate is pressed on the pipe orifice through a second screw arranged on the sealing cover. The spigot of the pipeline can clamp the sealing cover, and a thread spiral stretch principle is used for pressing the sealing pressure plate so as to generate a sealing effect; the tester needs no support points for sealing the pipeline, has low mounting space requirements, and can be applied to leak tests of irregular curve pipelines hardly having support point; the tester can suit pipelines of different sizes, and is strong in adaptability.