The invention relates to the technical field of carya illinoensis planting, and particularly provides a forest-grass-poultry ecological cycle mode for improving economic benefits of a carya illinoensis orchard. The ecological cycle mode comprises the steps of orchard site selection, variety selection, soil improvement, carya illinoensis planting, under-forest forage grass planting, poultry house construction and pasturing area division, irrigation and pest and disease damage management, poultry excrement treatment and use. Carya illinoensis planting, forage grass planting and poultry breedingare combined, the open space of an orchard forest is fully utilized, poultry are raised in the forest and fed by mowing forage grass, excrement generated by the poultry serves as organic fertilizer tobe applied to the orchard, and a water and fertilizer integrated drip irrigation system is adopted, so that water and soil protection is facilitated; moreover, the fertility of orchard soil is improved, the growth speed of trees is increased, the early economic benefits of the carya illinoensis orchard are improved, the growth of miscellaneous trees and weeds is reduced, the pesticide pollution area of forest land is reduced, the ecological environment of the orchard is obviously improved, and the ecological benefits are obviously improved.