Building energy-saving ventilating pipeline

The utility model relates to the technical field of building ventilation pipelines, and discloses a building energy-saving ventilation pipeline which comprises an air inlet connecting pipe, one end of the air inlet connecting pipe is connected with a connecting bent pipe, a middle connecting pipe is fixedly installed at the top of the connecting bent pipe, and an air exhaust bent pipe is fixedly installed at the top of the middle connecting pipe. The tail end of the exhaust elbow is in an inverted inclined shape, and a sealing mechanism is fixedly installed in the exhaust elbow. According to the building energy-saving ventilation pipeline, the upper exhaust bent pipe is installed at the top of the middle connecting pipe installed outside, and the tail end of the exhaust bent pipe is in an inverted inclined shape, so that rainwater can be prevented from entering the ventilation pipeline; due to the fact that the sealing mechanism is installed inside the air exhaust elbow, when air exhaust and air exchange are