Waterproof roll and its preparation method

The invention discloses a waterproof roll and its preparation method, and relates to the technical field of a waterproof material. The waterproof roll is used for improving sound absorption ability of the waterproof roll. The waterproof roll from bottom to top comprises a first isolating layer, a first asphalt layer, a tire base layer, a second asphalt layer and a second isolating layer; the waterproof roll further comprises a sound absorption layer arranged between the first asphalt layer and the second asphalt layer. For adding the sound absorption layer in the existing waterproof roll, the newly added sound absorption layer can absorb the most sound waves emitted to the waterproof rolls, thus the sound absorption ability of the sound absorption layer is improved. The invention is used for providing the waterproof roll with strong sound absorption ability. 本发明公开了种防水卷材及其制备方法，涉及防水材料技术领域，用于提高防水卷材的吸声能力。该防水卷材从下到上依次包括：第隔离层、第沥青层、胎基层、第二沥青层和第二隔离层，该防水卷材还包括设置于第沥青层和第二沥青层之间的吸声层。本发明所提供的防水卷材，在现有的防水卷材中增加了吸声层，新增加的吸声层可以让入射至防