The invention provides a voice broadcast method and system based on BLE beacons, and relates to the technical field of communication. The method comprises that a corresponding relationship table of MAC values and location introduction data stored in the database of a cloud server is adopted, wherein the corresponding relationship table is input/modified in the database by a manager terminal in advance; BLE devices at different locations transmit BLE signals outwards according to preset frequencies; a mobile terminal carried by a user scans the BLE signals transmitted by the BLE devices, analyzes the MAC values of the BLE devices carried in the BLE signals and sends the MAC values to a cloud server; the cloud server queries location introduction data corresponding to the MAC values from the database according to the MAC values and returns the location introduction data to the mobile terminal; and the mobile terminal automatically synthesizes voices according to the location introduction data and carries out voice broadcasting. According to the method and the system provided by the invention, the voice broadcasting contents can be modified according to the location of the user in real time; the voice broadcasting data corresponding to each location can be remotely modified; therefore, the voice broadcasting data are conveniently maintained; and the voice quality of the voice broadcasting is improved.