The invention relates to a device for absorbing outside noise by ferroelectric material. The traditional noise isolation plate has large thickness and low noise reducing efficiency. A plurality of cantilever beams are arranged inner side of the front outer plate at equal intervals in the horizontal and vertical directions. A ferroelectric film is arranged in the center of the upper surface of each cantilever beam. One end of each cantilever beam is vertically fixed to the front outer plate, and the other end thereof is vertically fixed to a trapping acoustic wave plate. The sound wave trapping plate is a sheet-shaped square surface. The side of the square is smaller than the distance between the adjacent cantilever beams. All sound wave trapping plates are positioned in the same plane, and the plane is parallel with the front outer plate. The cantilever beams, the ferroelectric films and the sound wave trapping plates on the rear outer plate are arranged in the same method. The front outer plate and the rear outer plate are arranged in a parallel and staggering way. The invention not only enhances the sound-absorbing and noise-decreasing efficiency, but also decreases the self thickness of the device.