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An air scrubbing system was developed to efficiently treat the exhaust emission from largescale pig house. The system utilized a combined scrubbing system that involved chemical method and waterwashing method. The realtime dynamic environmental data, including pH value, EC value, liquid level and differential pressure were collected. The intelligent control strategy was established via programmable logic controller (PLC) control system to regulate the startup of the washing pump and electron magnetic valve. In this manner, four work links: water supply, acid addition, spraying and waste emission were conducted automatically. At the mean time, the control system utilized MCGS touch screen to establish communication connection with PLC. In particular, the human machine interface was created to realize the monitor of system environmental data, dynamic display of operation process, configure system parameters, system alarm and other functions needed. Therefore, the system achieved the purpose of monitoring and controlling on the whole purification process, as well as satisfied the simple operation of system and visualization of the whole scrubbing process. Moreover, the system can also implement a variety of control modes according to the requirements of efficiency and economy in practical applications. It was found that all control modes were able to inhibit the emission of pig house effectively. The experimental results indicated that the removal rate of ammonia gas can reach 85%. The overall system was entirely well operated and easily controlled, and the economic costs were clearly quantified as well. This gas scrubbing system was successfully applied to a pig breeding farm in Jiangxi Province, which provided significant reference of air scrubbing techniques for livestock operations in practical engineering.