The invention discloses a detachable tube bundle tube pass reliability pressure testing device. The detachable tube bundle tube pass reliability pressure testing device comprises a fixed end flange lid, a heat exchange tube, a fixed end sealing ring, a fixed end O-shaped ring, a fixed end stud, a fixed end nut, a tube base, a limiting round cylinder, a fixed tube plate, a split wedge-shaped ring, a fixed end hook ring, a constant distance tube, a baffle plate, a support plate, a pull rod nut, a pull rod, a floating end hook ring, a floating tube plate, a floating end stud, a floating end flange lid, a floating end nut, a floating end O-shaped ring, a floating end sealing ring and the like. When pressure is tested, since the split wedge-shaped ring located at a fixed end is rigidly limited in the limiting round cylinder, due to the self-locking relation of the fixed end hook ring and the limiting round cylinder, the pressure testing process has high reliability; similarly, the floating end also has high reliability. Annular grooves are machined in the fixed end sealing ring and the floating end sealing ring respectively, and are used for placing the O-shaped rings, the sealing capacity is high, the pressure of dozens of Mpa can be borne, and the detachable tube bundle tube pass reliability pressure testing device is particularly suitable for tube pass high pressure test occasions. According to the detachable tube bundle tube pass reliability pressure testing device, the defects are solved that common detachable tube bundle tube pass pressure test tools are complicated to install, poor in safety, poor in leakproofness and incapable of achieving high pressure testing.