DB (A) noise source, and spread around, seriously polluting the surrounding environment and disturbing the normal work and life of surrounding people. By taking noise control measures, such as installing sound insulation cover, air inlet and exhaust silencing system, two-stage muffler of smoke exhaust pipe, sound insulation inspection door, sound absorption wall, sound absorption hanger, etc., the design and technical requirements of diesel generator can be met, the requirements of environmental protection standards can be met, the noise can be controlled within the range of environmental protection standards, and the hidden danger of noise pollution can be eliminated, Make a good and quiet environment around the diesel generator.