The invention discloses a digital-speech-based intelligent early warning system for a fully mechanized mining face. The digital-speech-based intelligent early warning system comprises a computer and intelligent pre-alarm substations. Each intelligent pre-alarm substation includes a first CPU unit; and the first CPU unit is in communication connection with a hydraulic bracket controller by a firstCAN transceiver, in communication connection with a belt conveyor controller through a second CAN transceiver, in communication connection with a gas monitoring substation through an RS485 transceiver, in communication connection with a computer through an RS232 transceiver, and in communication connection with a digital speech early alarm device through a third CAN transceiver. The digital-speech-based intelligent early warning system has the following advantages: early warning and alarming information of working faces of the hydraulic support controller, the belt conveyor controller, the gasmonitoring substation and the like are collected and pre-alarm information of a mine explosion-proof computer is set, so that a digital speech early warning device is driven to carry out fixed-pointand all-area early warning and playing of a fully mechanized mining face.