Abstract: In order to achieve real-time and accurate monitoring of environmental conditions such as methane,carbon monoxide,oxygen,ethylene and acetylene,temperature and humidity,and pressure in the goaf of coal mines,we propose a method based on the combination of mine multi parameter sensor technology and industrial Ethernet technology. Sampling is conducted in the goaf of coal mines,on-site detection and analysis is carried out,and the detection data is transmitted to the ground monitoring center through the underground Ethernet ring network. Big data modeling is used to analyze data changes,thereby achieving monitoring of complex environmental conditions in the goaf. Intelligent decision-making can be made according to abnormal data,thus assisting management personnel for safety production management,and achieving the goal of ensuring efficient and safe production of coal mines.