Ecological breeding method of pork pigs

The invention relates to the technical field of livestock breeding, and discloses an ecological breeding method for pork pigs. The method includes the steps of a piglet stage, wherein the piglets are fed with pig breast milk in a delivery house, and 5-7 days after birth, each piglet is fed with special fodder 4-5 times every day; a pig nursing stage, wherein one week after the piglets are weaned, the piglets are conveyed to a nursing house and regarded as nursed pigs, the nursing house is internally provided with fodder grooves and water grooves, and the piglets are fed with a mixture composed of fodder for the nursed pigs and disease-preventing medicine 5-6 times every day; a pig growth stage, wherein in a house for growing pigs, every 7-8 growing pigs are put together and surrounded by a fence, the occupied space of each growing pig is remained within 1.5-2 m , and a free-ranging site is constructed outside the house for the growing pigs; a pig fattening stage, wherein the pigs are divided into several grou