The invention discloses a starch master batch for filling modification of a degradable polymer material, and a preparation method thereof. The starch master batch for filling modification of the degradable polymer material comprises corn starch, biodegradable resin, a nonionic surfactant, a compatibilizer, glycerin, urea, KH550 and water. A composite modifier obtained by combining the nonionic surfactant with the reactive compatibilizer is adopted to improve the comprehensive mechanical properties of a biodegradable resin/starch composite material; the adopted biodegradable resin can improve the dispersion of the starch in the base resin to increase the filling amount of starch; and a plasticizer is replaced with the nonionic surfactant, so the production cost is reduced, and harms to human health are reduced.