Sewage treatment system for pig farm

The utility model relates to a sewage treatment system for a pig farm, the pig farm comprises a plurality of pig houses, and a plurality of pigsties are arranged in the pig houses; an indoor sewage collection system is arranged in the hog house and comprises a plurality of first sewage discharge channels and a plurality of second sewage discharge channels, the first sewage discharge channels are arranged below the hog houses, excrement and sewage generated by hogs in the hog houses can enter the first sewage discharge channels, the second sewage discharge channels are communicated with the first sewage discharge channels, and the first sewage discharge channels are communicated with the second sewage discharge channels. The second sewage draining channel is used for conveying the excrement and the sewage to a third sewage draining channel outside the hog house; the third sewage discharge channel is communicated with an outdoor sewage treatment system arranged outside the hog house, the outdoor sewage treatmen