Arbuscular mycorrhizal fungi inoculant, preparation method thereof and application thereof in ecological restoration of ionic rare earth tailing land

The invention provides an arbuscular mycorrhizal fungi inoculant, a preparation method thereof and an application of the arbuscular mycorrhizal fungi inoculant in ecological restoration of an ionic rare earth tailing land, and belongs to the technical field of ecological environment. The arbuscular mycorrhizal fungi inoculant comprises the following components: a culture base material and an underground part of a C4 plant cultured by adopting the culture base material, wherein the culture base material comprises arbuscular mycorrhizal fungi and a C4 plant propagation substrate. The arbuscular mycorrhizal fungi inoculant comprises a C4 plant root system, hyphae, spores and a propagation substrate. When the arbuscular mycorrhizal fungi inoculant is inoculated into ionic rare earth waste tailing soil, the survival rate of plants such as medicago sativa and ryegrass can be remarkably increased, growth and development of the plants can be promoted, and meanwhile the organic matter content of the soil can be increa