Combined type pre-tightness detection device

The utility model discloses a combined type pre-tightness testing device, which comprises a vacuum housing capable of forming a sealed space together with an angle iron weld joint being tested, wherein a manometer and a three-way valve are arranged on the vacuum housing including a left housing and a right housing, an opening matched with the shape of the angle iron is formed at the joint of the left housing and the right housing, and the peripheries of the left housing and the right housing are both encompassed by sealing rubber. The device can realize the effect that all fillet weld tests are completed on subsections, particularly the tightness tests of section steel penetrating the range of a watertight bulkhead, reduce the workload of slipway tightness tests, and shorten the berth period, thereby providing convenience for accelerating the shipbuilding and delivering the ship in time.