Abstract: In view of problems of existing measuring system of performance of mine ventilator based on MCU such as complex programming, complicated grasping and low stability and reliability, the paper introduced a design of measuring system of performance of mine ventilator based on PLC. It introduced working principle, hardware composition and software design of the system in details. The system adopts distributed measuring method, which can complete real-time collection of parameters of wind speed, relative static pressure, axle temperature, atmospheric pressure, phase current and phase voltage of mine ventilator, meanwhile can calculate air volume, power and efficiency of mine ventilator, etc. The system uses PLC as the core control unit for testing termination, which guarantees stability and reliability of the whole system.