Multi-user duplex talkback system and method based on Bluetooth

The invention discloses a multi-user duplex talkback system and method based on Bluetooth. By the multi-user duplex talkback system and method based on Bluetooth, pairing and communication of more than three Bluetooth talkback terminals can be realized; and the Bluetooth pairing mode and convenience of the Bluetooth talkback terminals are higher than those of the traditional talkback equipment. The multi-user duplex talkback system based on Bluetooth comprises at least three Bluetooth talkback terminals which can be paired and matched with one another; each Bluetooth talkback terminal comprises a Bluetooth module and a man-machine interaction interface hardware module; each man-machine interaction interface hardware module comprises a key for using a Bluetooth function and controlling information of the corresponding Bluetooth talkback terminal, an LED indicator lamp, a battery, a loudspeaker and a microphone; and each man-machine interaction interface hardware module comprises a pairing module for pairing tw