Abstract: In this paper, computational fluid dynamics (CFD) technology is used to numerically simulate the flow characteristics of a new rotating biological contactor for sewage treatment in pig farms. The results show that the new rotating biological contactor can increase the distribution surface of the biofilm, improve its sewage purification area, increase its own utilization rateand achieve better sewage purification. The rotating speed of 6rpmis more conducive to the gas-liquid two-phase contact than that of 3 r/min.