[Objectives] To treat pig farm wastewater and solve the problem of pollution caused by it to surface water or groundwater. [Methods] Fe and Zn/biochar (AC) was prepared by dipping method using pig manure-derived biochar as carrier. The preparation conditions were investigated, and the screened metal-loaded biochar was characterized. Pig farm waste water was treated with metal-loaded biochar-H2O2 catalytic oxidation method. [Results] At the COD concentration of 2 904 mg/L, 0.02 g Zn/AC and 0.005 mL H2O2 showed the highest COD removal rate (qe) from pig breeding wastewater under conditions of reaction time of 8 h, pH value of 7 and temperature of 55 ℃, reaching 70.98%. [Conclusions] Fe or Zn-loaded biochar made from pig manure-derived activated carbon has a certain catalytic capacity for the actual oxidation treatment of pig farm wastewater. The activity of Zn/AC was higher, and its COD removal rate from pig farm wastewater was also higher.