Disclosed is potable Bluetooth sound amplification device which includes a Bluetooth module that is used to be communicated with a Bluetooth communication device wirelessly and to output an audio source signal; an audio source switch module that is connected on the Bluetooth module and used for receiving the audio source signal; a loudspeaker connected on the audio source switch module; a wire retracting unit which is provided with a wire trough, a winding disk, a communication wire and a volute spring; and a judging unit. The winding disk and the volute spring are arranged in the wire trough, the communication wire is wound on the winding disk and can be stretched out or furled, one end of the communication wire is connected with the audio switch module and the other end is connected with a earphone. The judge unit is connected with the audio source switch module and the wire retracting unit, and outputs a judging signal to the audio source switch module to control the switch of the audio source signal according to the stretching or furling of the communication wire.