The invention discloses a frosted mulberry leaf deastringenting treatment technology and submicron powder thereof. According to the technology, coix seed fermentation products are mainly used as a deastringenting agent, and through combination of steaming for three times and hot air drying, lonicera japonica is subjected to deastringenting. A simple working procedure is used for solving the problems of astringing mouth feel and green odor of the frosted mulberry leaves, special taste and delicate fragrance of the mulberry leaves are reserved, unique mellow fragrance and ester fragrance can also be added, and the layering degree of nourishing smell is rich. The prepared deastringent mulberry leaf submicron powder is high in retention rate of main nutrient components, and is obvious in restraining effects on alpha-glucosidases and pancrelipase, and can be used as a food base material for developing healthy foods for reducing blood sugar and blood lipid.