A speaker box includes a housing, a speaker unit and a flexible circuit board. The housing includes a base defining a through hole, and a cover. The flexible circuit board includes an end received in the housing and an opposite end exposed to outside of the housing. The flexible circuit board includes a first surface facing the cover and a second surface opposite to the cover. A first pad and a second pad are disposed at the second surface. The flexible circuit board includes a first mounting part, a second mounting part and a bending part. The first pad is arranged on the first mounting part and configured to be electrically coupled to the speaker unit. The second pad is arranged on the second mounting part and configured to be electrically coupled to external circuits. The second pad is exposed to outside of the housing via the through hole.