Method for building farmland ecosystem with multiple mutual-benefit species in multiple habitats

A method for building a farmland ecosystem with multiple mutual-benefit species in multiple habitats, comprising the steps of:

• a. marking out an ecological field plot for planting crops in a farmland, arranging one to three earthworm breeding strip stack(s) at equal intervals according to a length of the ecological field plot, and marking out different planting areas of the ecological field plot by the earthworm breeding strip stack(s);
• b. digging an ecological field ditch surrounding the ecological field plot at a periphery of the ecological field plot, and planting aquatic plants and breeding aquatic animals in the ecological field ditch;
• c. surrounding the ecological field ditch with an ecological wide ridge at a periphery of the ecological field ditch, planting forage plants on a ridge surface of the ecological wide ridge, and planting arbors on an outer side of the ecological wide ridge, so as to form a field forest network;
• and
• d. arranging an ecological pond on a drainage side of a hole formed by the ecological field plot, the ecological field ditch and the ecological wide ridge, wherein aquatic plants are planted in the ecological pond, and crustaceans are bred in the ecological pond.