Silencing air pipe

The invention provides a silencing air duct, and belongs to the technical field of building ventilation, the silencing air duct comprises a straight pipe section and a bent pipe section, the straight pipe section and the bent pipe section are connected together through a flange mechanism, and a plurality of gas flow guide silencing plates are arranged in the bent pipe section. A trumpet-shaped structure with a large opening on one side and a small opening on the other side is formed between the adjacent gas flow guide silencing plates, and the side with the large opening faces the gas circulation direction; a plurality of noise reduction dampers are arranged on the straight pipe section close to the position connected with the bent pipe section; the silencing dampers comprise silencing blocks and springs, the springs are connected to the upper top faces and the lower top faces of the silencing blocks, the silencing blocks are hung in the air channel of the straight pipe section through the springs, all the si