The invention relates to an 
automatic control method of a mill during the production process of 
cement and a device thereof. The method is that: a program controller is adopted to control a plurality of links of material 
powder preparation; a milling sound monitoring instrument is used for monitoring the milling sound change during operation, a 
dust collector fan 
inverter is used for controlling the rotating speed, instrument used for detecting the wind pressure in the mill outputs wind pressure signals to the program controller, a controller is used for controlling fan 
frequency conversion, an 
inverter is used by a 
powder-choosing 
machine for controlling the rotating speed of a rotor of the 
powder-choosing 
machine and the program controller adjusts the rotor 
frequency conversion of the powder-choosing 
machine according to the input data; a 
hot blast stove is arranged in front of the mill to raise temperature in the mill and cause 
water content of the materials to be evaporated in the mill, a 
thermocouple is applied at the hot wind inlet in front of the mill to monitoring the temperature of the hot wind entering the mill and leading the temperature to rise to a standard that can evaporate 
water content of the materials in the mill. The invention has the advantages of simple structure, reliable operation, high testing precision, the running of the mill being timely and accurately monitored by operators in a control chamber, thus realizing manual monitoring, reducing labor intensity of workers, increasing output and reducing 
power consumption.