The invention provides a voice talkback method. The voice talkback method comprises the following steps: switching working modes of a Wi-Fi (Wireless Fidelity) communication module and a GPS (Global Positioning System) module of a first mobile terminal to a talkback mode; searching for at least one second mobile terminal within an effective communication range of the first mobile terminal, wherein a Wi-Fi communication module and a GPS module of the second mobile terminal are in the talkback mode; and acquiring a voice signal through the first mobile terminal, and transmitting the voice signal to the GPS module of the second mobile terminal through the Wi-Fi communication module of the first mobile terminal. Moreover, the invention also provides a voice talkback system and a mobile terminal. Through adoption of the voice talkback method and system, short-distance full duplex voice talkback communication among a plurality of mobile terminals can be realized; the practicability of the mobile terminals is improved; and the communication cost is saved.