The utility model relates to a pig-raising wastewater treatment system. The pig-raising wastewater treatment system comprises an MAP (magnesium ammonium phosphate) chemical precipitation tank (1) for recovering nitrogen and phosphorus components in sewage and a biochemical reactor (8) for treating supernatant liquid from the MAP chemical precipitation tank, wherein a supernatant liquid outlet of the MAP chemical precipitation tank is connected with a supernatant liquid inlet of an anaerobic filter tank (2) of the biochemical reactor, an anaerobic water outlet of the anaerobic filter tank is connected with an anaerobic water inlet of an aerobic aeration tank (7), an aerobic water outlet of the aerobic aeration tank is connected with an aerobic water inlet of a precipitation tank (5), and a biogas outlet of the anaerobic filter tank (2) is connected with a biogas collecting tank (3). The pig-raising wastewater treatment system disclosed by the utility model can reduce energy consumption, reduces sewage treatment cost and simultaneously prepares an organic compound fertilizer from the sewage.