Online early warning system for mine ventilator

The utility model relates to the field of ventilators, and discloses an online early warning system for a mine ventilator, which comprises a vibration detection unit, a current fluctuation detection unit and an alarm unit, the vibration detection unit comprises a vibration sensor, a ventilator and a PLC (Programmable Logic Controller); when the vibration amplitude exceeds a set threshold value, an alarm signal is sent to the PLC; the current fluctuation detection unit comprises an alternating current Hall current sensor, a ventilator and a PLC (Programmable Logic Controller), and sends an alarm signal to the PLC when the current difference exceeds a set threshold value; the alarm unit comprises a frequency converter, a PLC (Programmable Logic Controller) and an underground looped network platform, the PLC is in communication connection with the frequency converter and the underground looped network platform, and after receiving an alarm signal, the PLC transmits the alarm signal to the underground looped netw