The invention provides a pipeline pressure testing device. The device is applicable to pressure tests of various pipelines with the pressure lower than 3.0MPa; the pipeline pressure testing device comprises a pressure testing unit and a pressurizing unit; the pressurizing unit is connected with the pressure testing unit through a pipeline; the pressure testing unit is arranged in a pipeline to besubjected to pressure testing; the pressurizing unit is arranged at the outer part of the pipeline to be subjected to the pressure testing. According to the pipeline pressure testing device, the aim of sealing the pipeline is realized through tight contact between a rubber expansion pipe (an air expansion pipe) and an inner wall of the pressure testing pipeline; the pressure test is simple and canbe repeatedly utilized.