The invention relates to a speaker enclosure and a method for fabricating the same. The speaker enclosure comprises a main housing, a top cover, and a bottom plate. The main housing fabricated by a molding process and having a continuous side wall, end faces, and an inner space, wherein, a plurality of ribs are formed on the inner surface of the continuous side wall, so that the inner surface is an irregular surface. Therefore, the reflected direction of sound waves generated by a speaker unit in the inner space will be changed and the amplitude of sound waves will be decreased by an irregular surface formed in the inner surface of the continuous side wall. As the result, standing waves and echoes mixing with original sound waves may be eliminated.