Pressure testing device for flange weld joints

The utility model provides a pressure testing device for flange weld joints, which at least comprises a first end component and a second end component. The first end component is arranged on one side of a weld joint of a pipeline to be tested, is positioned inside the pipeline to be tested and consists of a first sealing device, the first sealing device comprises a first sealing ring and a first end squeezing device, the first sealing ring seals a first end of the pipeline to be tested, the outer lateral surface of the first sealing ring is cylindrical, the first sealing ring is disposed on one side of the weld joint, and the first end squeezing device squeezes the first sealing ring. The second end component is disposed on the other side of the weld joint, is connected with the first end component and consists of a second sealing device, a pressuring hole and a pressure measuring hole, the second sealing device seals a second end of the pipeline to be tested, and the pressuring hole and the pressure measuring hole are communicated with a test space of the pipeline to be tested. The pressure testing device for the flange weld joints omits a large-size container for storing pressure testing media when testing pressure of the weld joints and is stable in sealing effect.