The present invention relates to building pipeline, and is especially an angle-adjustable pipeline system, which includes at least one angle regulating pipe comprising at least two sections of pipe with inclined ends to constitute rotating movable planes for connection mutually, and is mainly used in building ventilation, sunlight conduction, lighting wall, holding pipe, mine ventilation, etc. The present invention makes it possible to regulate angle in site easily, and this simplifies the construction of building pipeline and lowers the construction cost. |