Exhausting cooling-down denoising system for diesel engine

The utility model relates to a gas discharge temperature and noise reducing system, in particular to a structural improvement of a gas discharge temperature and noise reducing system of a diesel engine. The gas discharge temperature and noise reducing system of the diesel engine comprises a sound damper (2) connected with a main exhaust pipe (1) of the diesel engine, a water spray thrower (3) arranged between the main exhaust pipe (1) of the diesel engine and the sound damper (2), and a water cooling device (4) connected on the water spray thrower (3). Therefore, the utility model has the advantages that the design is rational, the structure is simple, the service life is long, and the promotion is easy; in the condition of small fluid pressure loss and small equipment installation space, the waste gas of the diesel engine can be effectively cooled down before reaching a waste gas inlet opening of the sound damper, the waste gas temperature is reduced, and the density and the flow speed are reduced, thereby r