The invention aims to disclose a sound-insulation anti-theft door good in sound-insulation effect. The sound-insulation anti-theft door comprises a door body and filler in the door body. The surface of the filler closely makes contact with the inner side face of the door body. The filler is composed of a framework and a foaming layer attached to the framework. The framework is composed of a sound-insulation plate in the middle and a plurality of umbrella-shaped sound diffusing parts located on the two sides of the sound-insulation plate. The small-diameter ends of the sound diffusing parts are fixedly connected with the sound-insulation plate. The foaming layer is attached to the sound-insulation plate, and the inside of the sound diffusing parts and the gaps between the sound diffusing parts and the sound-insulation plate are filled with the foaming layer. According to the anti-theft door, the framework with acoustic sound-insulation and sound diffusing effects is additionally arranged in the filler, so the sound-insulation property of the anti-theft door can be greatly improved, the cost is low, production and manufacturing are convenient, and commercial prospects are very good.