Bluetooth earphone, client device and anti-theft system and anti-theft method of bluetooth earphone

The invention discloses a bluetooth earphone, a client device and an anti-theft system and an anti-theft method of the bluetooth earphone. The bluetooth earphone comprises a storage module, a bluetooth module, a judgment module and a control module, wherein the storage module is used for storing a password of the bluetooth earphone; the bluetooth module is used for establishing bluetooth connection with the client device and receiving a password sent by the client device after the bluetooth earphone is powered on; the judgment module is used for judging whether the received password is the same as the stored password or not, if so, the judgment module returns a verification pass message back to the client device, and if not, the judgment module returns a verification failure message back to the client device; and the control module is used for controlling the bluetooth earphone to start a normal earphone mode after the verification pass message is returned back to the client device, or controlling the bluetoo