Abstract: In order to solve the difficulties of long-distance driving face cooling, cooling costly questions are designed automatic cooling system. The system has two sets of refrigeration equipment “A”, “B”,”A” group of the cooling capacity of refrigeration equipment has been sent to an ordinary hair dryer boring head, group “B” refrigeration equipment cooling capacity by the modified general release in the roadway in duct. A set of devices always maintain the normal operation, group B only after refrigeration equipment turned on when the pedestrian roadway, this action by means of infrared body sensors, PLC and relay together. Practice shows: automatic cooling system safe and reliable operation, greatly improved the working environment of workers and reduce the cooling cost of inputs.