The invention relates to a preparation method for a general flavone extract, in particular to a preparation method for a reproducible general flavone extract from seed coats of perennial xylophyta peony. The general flavone extract from the seed coats of the peony is prepared by extracting and purifying residual seed coats generated during the peony seed oil machining process. The preparation method comprises the following steps of: crushing dry seed coats of the peony by taking the dry seed coats of the peony as raw materials, and then, adding to an extraction kettle; extracting by using water or water-contained alcohol; merging extracts; concentrating to obtain extractum; dissolving the extractum by adding the water or the water-contained alcohol; centrifuging to obtain supernate; eluting the supernate by using the water or the water-contained alcohol through a polyamide resin column; then, eluting with alcohol or the water-contained alcohol; collecting eluent; and concentrating and drying the eluent to obtain the general flavone extract from the seed coats of the peony. Flavonoid matter is extracted from useless seed coats of the peony. During the whole preparation process, the process is simple, and the energy consumption is low. Used solvents are the alcohol and the water, can be recycled, are pollution-free and are better in environmental benefit. The general flavone content in the obtained extract is high and is better in economic benefit and social benefit.