The invention discloses a preparation method of a sustained-release fragrant fabric. The preparation method comprises the steps of: (1) putting a 200-300nm porous mineral material (sepiolite, Xixia county Jinxiang mining limited liability company) in a high-speed mixer and performing beating to prepare a suspension slurry; adding natural aromatic substances into the suspension slurry in the high-speed mixer, and carrying out dewatering, drying, drying and grinding treatment to obtain load aromatic powder with a water content of less than 10%; (2) feeding mixing equipment with the grinded load aromatic powder and polyester fiber plain sheet by a single-screw feeder and carrying out mixing treatment, then sending the mixed materials into melt spinning equipment to conduct melting and spinning, then conducting consolidation forming in acid bath, and then carrying out drafting, washing, desulfurization, bleaching, oiling, dehydration, cutting and drying, thus obtaining aromatic fiber; (3) blending the aromatic fiber with cotton to obtain long-acting aromatic yarn; (4) performing weaving treatment; and (5) carrying out after-finishing treatment on the woven fabric. The fabric prepared by the method provided by the invention has fragrance lasting for more than two years, and can be washable by over 20 times.