A Bluetooth sound box comprises a box body and an integrated circuit board installed in the box body, the integrated circuit board is provided with a sound production unit and a signal receiving unit,the signal receiving unit is used for receiving Bluetooth signals of a mobile phone, and the Bluetooth sound box further comprises a sound transmission mechanism and a horn. The sound transmission mechanism and the horn are both installed in the box body, a sound transmission cavity is arranged in the sound transmission mechanism, one end of the sound transmission cavity is connected with the sound production unit, the other end of the sound transmission cavity is connected with a sound inlet of the horn, a sound outlet of the horn is installed at one end of the box body, and an opening is formed in the end, provided with the horn sound outlet, of the box body. According to the utility model, the horn is used to amplify the sound emitted by the sounding unit, the playing effect of the normal Bluetooth sound box can be achieved or surpassed by using lower power consumption than the normal Bluetooth sound box, and the endurance is improved; or a better effect is achieved with the same power consumption.