Ecological pig raising can not only reduce the production cost of pig raising, but also produce green food beneficial to human health. The basic guiding ideology of ecological pig industry is to make full use of the biological characteristics of pigs, make full use of all kinds of natural ecological environment and natural resources as much as possible, and reduce or not use artificial chemical synthetic substances and artificial energy, thus greatly improving the utilization rate of natural resources and reducing the comprehensive cost of pig industry to the lowest point. The core content of ecological pig raising is to deal with the environmental pollution of pig farms, take pigs as the main animal population as the production system, and take pig manure and pig urine pollution as valuable resources of other biological communities or other agricultural production to realize pollution-free pig raising, thus protecting the agricultural ecological environment very effectively. When raising pigs in a pollution-free environment, natural substances and natural feed resources should be used as much as possible, and synthetic chemical additives, drugs and other antibiotics should be used less, which will not cause new environmental pollution and can produce green pork products that meet the requirements. For example, the natural pig raising method and the ecological pig raising method combining pig raising, biogas and planting are all very popular.