The invention discloses a noise reduction device for a boiler plant of a power station. A hook nail vertical to the wall surface is welded on the outer wall of the equipment, and a centrifugal glass wool layer, a rock wool layer, plastering layers made from a sound absorption plastering material and a color plate outer protective layer are sequentially laid on the wall surface of the outer wall of the equipment; after the outer sides of the centrifugal glass wool layer and the rock wool layer are tightened by a wire mesh layer, the sound absorption plastering material is plastered outside the centrifugal glass wool layer and the rock wool layer so as to form the plastering layers, and the hook nail penetrates through the centrifugal glass wool layer and the rock wool layer and then is directly inserted into a wire mesh for tightening; the centrifugal glass wool layer is 45-55mm in thickness, and 32kg/cu.m. in volume weight; the rock wool layer is 45-55mm in thickness, and 100kg/ cu.m. in volume weight; and the plastering layers are 25-35mm in thickness. The noise reduction device has the characteristics of being simple in structure, convenient and reliable to construct, obvious in noise reduction effect and the like.