Interval air discharge pipe for diesel engine

The invention relates to an interval air discharge pipe for a diesel engine. The interval air discharge pipe comprises an air discharge outer pipe (1), an air discharge inner pipe (2) and a supporting structure (3), wherein the air discharge outer pipe (1) and the air discharge inner pipe (2) are connected and supported by the supporting structure (3); an interspace interval (4) is formed between the air discharge outer pipe (1) and the air discharge inner pipe (2), and is filled with gas. The interval air discharge pipe has the advantages that through the utilization of different heat transfer coefficients of gas and metal, the air discharge energy at a turbine inlet, which is transmitted outwards, is reduced, useful air discharge energy at the turbine inlet is improved, and the fuel consumption of an exhaust turbocharging diesel engine is reduced; the temperature of an engine compartment of a vehicle is reduced, the thermal load of the engine compartment is alleviated, and the air inlet ability of the exhaust turbocharging diesel engine is improved.