The invention provides a stereo packaging box which comprises a box body. The box body is internally provided with a lower paper support, an upper paper support and an inner box body. The upper portion of the lower paper support is provided with a first installation groove, and the lower portion of the upper paper support is provided with a second installation groove corresponding to the first installation groove in position. The inner box body is arranged between the first installation groove and the second installation groove in a clamped mode. The upper portion of the lower paper support is further provided with a first containing cavity for containing a stereo product, and the lower portion of the upper paper support is provided with a second containing cavity corresponding to the first containing cavity. The side faces of the lower paper support and the side faces of the upper paper support are provided with reinforcing portions respectively. The middle of the bottom of the lower paper support is further provided with a boss structure. The outer surface, at the position of a loudspeaker, of the front face of the stereo product is ordinarily a mesh face, to prevent the paper supports from rubbing with the product mesh face and prevent the mesh face from being scratched, keep-space design is adopted in the upper paper support and the lower paper support, the middle of the bottom of the lower paper support is provided with the boss structure, displacement of the product is avoided, the side faces of the upper paper support and the side faces of the lower paper support are provided with the reinforcing portions respectively, the whole paper support structure is made to be firmer, and the inner box body is arranged between the upper paper support and the lower paper support, so that fixation can be well conducted, and space can be further saved.