The invention relates to a sliding pipe gathering component, and belongs to the technical field of fluid conveying pipelines. The component comprises a first metal pipe and a second metal pipe which are butted with each other, wherein one of the two metal pipes is provided with a butting flange edge, and the other metal pipe is provided with a butting external thread; locking nuts screwed with external threads are sleeved at butted joints of the two metal pipes; a second flange which is sealed in the radial direction is sleeved outside the first metal pipe; a first flange is arranged at one end, which is adjacent to the second metal pipe, of the second flange; a third flange is arranged at one end, which is far away from the second metal pipe, of the second flange; the first flange is sealed and welded with an inner hole of an inner barrel; a radial and axial sealing piece is arranged at a joint of the first flange and the second flange; and the first flange, the second flange and the third flange are fixedly connected with one another through axial fastening pieces. By the sliding pipe gathering component, the problem that the conventional detachable orifice structure cannot be reliably sealed under a working condition of ultrahigh temperature is solved; the sealing property of the assembled sliding pipe gathering component is guaranteed; and influence of thermal stress on sealing is avoided.