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The current remote monitoring system for the diary farm environment is lack of mobility and too complicated to handle with high power consumption. Based on above, this paper developed a novel remote monitoring system for the diary farm environment based on the Ethernet and the public platform with WeChat. The new system can realize the accurate acquisition and remote realtime monitoring with respect to the environmental parameters, such as the temperature, humidity, CO2 concentration, H2S concentration, SO2 concentration, NH3 concentration, etc. Ethernet was used to transmit the collected data. The industrial configuration software, Kingview 6.55, was adopted to develop the monitoring software system for the upper computer. The database of the aforementioned system was connected with the public platform with WeChat. A WeChat client was established on the smart phone to remotely monitor the environment of the diary farm. Case studies were carried out on the simulation experiments of the laboratory and the actual operations of a dairy farm. It is shown that this novel monitoring system had high stability and reliability and good realtime performance with satisfactory monitoring effect. The data packet loss rate was lower than 0.041% in the range of 100m. This system can effectively solve the problem of realtimely and remotely monitoring the environmental information of a cow house.