The monitoring system is an important system on the mine ventilator and requires continuous upgrades and improved design. Aiming at the problems of single control function, small monitoring range and insufficient monitoring precision of the ventilator monitoring system of Yangquan Mining Group No.1 Mine, combined with the structural composition and performance characteristics of the mine ventilator, the hardware and software improvement and optimization design of the monitoring system and the field test were carried out,. The test results showed that the improved monitoring system monitoring function and monitoring effect and the monitoring level of the fan monitoring system were improved, and the safe operation of the fan was ensured.