The invention provides a noise reduction device for a dry-type hollow filter reactor. The noise reduction device comprises a top noise reduction part, a main body noise reduction part and a bottom noise reduction part, wherein the top noise reduction part is ball coronary, the inner surface of the top noise reduction part is provided with sound absorption cotton, and the lower surface of the top noise reduction part is provided with a supporting piece so as to support the top noise reduction part; the main body noise reduction part is cylindrical, and the inner surface of the main body noise reduction part is provided with sound absorption cotton; the bottom noise reduction part is in the shape of a circular ring, and is fixed on a supporting object through a bottom connecting piece; the upper end of the main body noise reduction part is covered with the top noise reduction part, and the bottom noise reduction part is connected to the lower part of the main body noise reduction part so as to form a closed space for accommodating the dry-type hollow filter reactor. According to the noise reduction device, by improving the structure and materials, the noise of the reactor accommodated in the noise reduction device can be obviously reduced.