The utility model discloses a damping and silencing device of a ventilation opening of a generating layer. The damping and silencing device comprises a shutter positioned at the ventilation opening of the generating layer, and is characterized in that blades of the shutter are inclined; the blades are fixed installed on the frame of the shutter; a silencing ventilating window is arranged on the inner side of the shutter; the silencing ventilating window is fixedly arranged in a ventilating duct; the silencing ventilating window comprises a frame and a columnar silencing fence arranged in the frame region; both the frame and the columnar silencing fence are made of super-microporous acoustic boards with galvanized surfaces; both the frame and the columnar silencing fence are made of at least two layers of super-microporous acoustic boards with galvanized surfaces; a sound insulation layer and/or activated carbon fiber are/is filled between the two or more layers of super-microporous acoustic boards with galvanized surfaces. The damping and silencing device has the advantages that the silencing effect is good, the damping and silencing device is light and environment-friendly, secondary pollution can be avoided, the cost is low, the damping and silencing device is easy to promote, a damping layer is filled between the frame and the air duct, and the vibrating noise produced by the vibration of a wall body after the shutter is installed is reduced.