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This utility model belongs to the field of water supply and drainage pipeline construction technology, specifically providing a wall-penetrating structure for building water supply and drainage pipelines. It includes a wall-penetrating sleeve, in which the water supply and drainage pipes pass, and the two are sealed together by multiple sealing components. Each sealing component includes a mounting base, an elastic airbag, and an air guide pipe. The mounting base is fitted onto the water supply and drainage pipe and has an mounting groove. One side of the elastic airbag is fixedly installed at the bottom of the mounting groove. One end of the air guide pipe communicates with the elastic airbag, and the other end communicates with an external air pump or is sealed by a sealing plug. The other end extends beyond the top of the mounting groove under the action of the external air pump, abutting against the inner wall of the wall-penetrating sleeve. This utility model, through the arrangement of multiple sealing components including a mounting base, an elastic airbag, and an air guide pipe, allows for temporary assembly and disassembly of the water supply and drainage pipes and the wall-penetrating sleeve by inflating and deflating the elastic airbag, which is convenient and quick. Furthermore, it can adaptively adjust according to the deformation of the wall-penetrating sleeve, ensuring the sealing performance between the two.