A portable Bluetooth speaker includes a Bluetooth module for communicating wirelessly with a Bluetooth communication device and outputting a voice signal, a voice switching module connected with the Bluetooth module for receiving the voice signal, a speaker connected with the Bluetooth module, a wire-receiving unit having a wire slot, a wire-rolling disk, a communication wire, a volute spring, and a judging unit connected with the voice switching module and the wire-receiving unit. Due to the volute spring, the communication wire can be extended or received. One end of the communication wire is connected with the voice switching module. The second end of the communication wire is connected with the earphone. The judging unit outputs a judging signal to the voice switching module for switching the voice signal according to the communication wire being extended or received.
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