The present disclosure discloses a loudspeaker box, including a foam, a loudspeaker and a box having an opening of the box. The loudspeaker is internally placed inside the box through the opening of the box, an outer surface of the loudspeaker is aligned to an edge of the opening of the box, a gap is set between the loudspeaker and the opening of the box, and a bottom portion of the loudspeaker abuts against the bottom portion of the box; and the foam is annularly covered on the gap between the loudspeaker and the opening of the box, such that the integral thickness of the loudspeaker box is reduced.