Abstract: Firstly,this paper introduces the key technological points of the intelligent biogas engineering system by taking Xin-xing seed-pig pig farms as an example,including pH monitoring system of acidification tank and biogas digester,intelligent feeding system, heating system for FRP digester, bio-gas automatic mixing system, gas flowing metering system and internet remote control system.Then,it takes a comparison of the cost and gas production rate between intelligent biogas engineering and traditional biogas engineering, the result showing that: for the long-term sustainable operation of biogas engineering, intelligent biogas engineering is more according with the cost-benefit principle; technology system of intelligent biogas engineering can create the best environment for biogas fermentation, thus it can get the highest efficiency of gas production.