The invention discloses a method for treating livestock and poultry breeding wastewater, which comprises: planting centella asiatica in a livestock and poultry breeding wastewater polluted environment. Because the centella asiatica has the characteristics of absorbing and removing pollutants, such as total nitrogen, total phosphorus, ammonia nitrogen and the like, from the livestock and poultry breeding wastewater, the centella asiatica is planted in the livestock and poultry breeding wastewater polluted environment to absorb and remove the pollutants, such as total nitrogen, total phosphorus, ammonia nitrogen and the like, from the livestock and poultry breeding wastewater so as to fulfill the aim of purifying the livestock and poultry breeding wastewater. Because the centella asiatica has great vitality and does not need to be specially managed in the growing process thereof, the method is low in cost and low in operation fee and has a good effect and strong operability; at the sametime, the centella asiatica has relatively high medicinal values, can be used as medicaments entirely and has the effects of clearing heat, promoting diuresis, dispelling swelling, detoxifying and treating acute filthy diseases, stomachache, heat diarrhea, dysentery, damp and hot jaundice, difficulty and pain in micturition, haematemesis, hemoptysis, hot eyes, swollen throat, rubella, acariasis, boils, pyogenic infections, traumatic injury and the like.