In order to solve the malodor in the agglomeration pig farms in Dezhou City, Shandong Province, the ammonia removals of four types of low-temperature plasma equipments (high-energy wire barrel, high-energy wire plate, low-energy wire barrel, low-energy wire plate) were studied through pilot test. The results showed that with constant high ventilation rate in the pig house, the high-energy wire barrel equipment had the highest ammonia removal efficiency of 70.03%. The addition of catalyst would increase the ammonia removal efficiency by 4.64%. When the initial concentration of NH3 at the fan outlet of the pig house was 1.97~5.89 mg/m3, the concentration of NH3 was reduced to 0.50~0.92 mg/m3 after treatment by the high-energy wire barrel equipment. The operating costs of the system in summer and winter were 258.39 yuan/d and 103.36 yuan/d, respectively.