Intelligent grinding sound measuring system receive the ball mill sounds by using special sensor, then transfer the signal through shielded cable to instrument, convert the signal into percentage display on the screen, at the same time output 4~20mA current signal for DCS system. Which can quantitative measuring the load of the ball mill, enable the user control the mill feeding material flow, built-in calibration signal source, convenience for maintenance and inspection; sound and light alarm when empty or full mill, suitable for various mills efficient operation and increase production.