The utility model discloses a multilayer protection noise reduction device for a transformer. External acoustic panel, an inner sound insulation plate is arranged in the outer sound insulation plate;a first top plate is arranged above the inner sound insulation plate; a second top plate is arranged above the first top plate, heat dissipation holes are formed in the surface of the outer sound insulation plate, protrusions are arranged on the inner surface of the outer sound insulation plate, the first top plate is inserted into the mounting holes, the ends of the two sides of the second top plate are connected with the clamping grooves in a clamped mode, a bottom plate is arranged on the lower portion of the outer sound insulation plate, and a mounting base is arranged on the inner side ofthe bottom plate. According to the multi-layer protection and noise reduction type transformer, the outer sound insulation plate and the inner sound insulation plate which are combined are arranged outside the transformer to form a multi-layer protection and noise reduction structure; a gap is formed between the outer sound insulation plate and the inner sound insulation plate, noise propagationis reduced, meanwhile, the sound insulation cavities and the protrusions treat noise, noise reduction treatment is carried out under the condition that the internal structure of the transformer is notchanged, the structure is simple, and cost is low.