The invention provides a soil improvement material for ecologically restoring difficult site conditions and a preparation method and application thereof.The soil improvement material capable of being used for
plant planting comprises a slow-release
capsule coating body, the slow-release
capsule coating body is composed of three
layers of capsules which are coaxially arranged at intervals, an inner cavity of the inner layer
capsule is filled with a
fiber drying agent, and the inner layer capsule is filled with a
fiber drying agent; a
composite material capable of exploding after absorbing soil
moisture is filled between the inner-layer capsule and the middle-layer capsule, and
dry sand grains are filled between the middle-layer capsule and the outer-layer capsule; the preparation method comprises the following steps: rolling a
fiber drying sheet into a
solid cylinder structure with a set
diameter, tightening the
solid cylinder structure with
plant fibers to obtain a roll-type
plant fiber drying agent, then loading the roll-type plant fiber drying agent into an inner-layer capsule, sealing the inner-layer capsule, and then
coating the inner-layer capsule with a
composite material and
dry sand grains. The
soil conditioner can be used for soil improvement in an area with a deep soil layer, and the air permeability and the loose state of the soil can be kept for a long time.