The invention mainly relates to the field of planting and discloses a crape myrtle culture medium. The crape myrtle culture medium is prepared from the following raw material: crape myrtle bark, rice chaff, maize straws, waste culture medium of edible fungi, biogas residues, bagasse, waste material of slaughtering, broccoli stems, EM bacteria, traditional Chinese medicines, red clover extract, slaked lime, vermiculite, diatomite and zeolite. The raw materials are rich, the nutrition is balanced, and the crape myrtle culture medium can provide nutritional ingredients, resist bacteria, kill insects and enhance the disease resistance of crape myrtles, so that the survival rate of the crape myrtle reaches 100%, the rate of diseases and pests is reduced to 4%, and the economic benefits are improved by 11.2%. The raw materials are fermented by mixed bacteria, and the added zeolite is enriched in micromolecular beneficial components, so that the growth, early flowering and production of a lot of flowers can be promoted, so that the flowering phase is prolonged by 20-25 days, and the ornamental value is improved. The crape myrtle culture medium is synergistic with multiple Chinese herbal medicines so as to inhibit diseases and pests, the incidence rate of the diseases and pests is reduced, usage of pesticides and bactericides is reduced, and the planting cost is saved. The medium is dried, contains multiple probiotics and is convenient to transport and use.