The invention discloses a Xiao'er Feireping capsule and a preparation method thereof. The preparation method is characterized by comprising the following steps: taking 45 g of pogostemon cablin, 80 g of pericarpium granati, 39 g of flos magnoliae, 3.3 g of calculus bovis, 55 g of lumbricus, 9.9 g of pearl, 44 g of polygonum bistorta, 55 g of fritillary bulb, 0.27 g of musk, 44 g of coptidis rhizome, 88 g of radix scutellariae, 1 g of cornu saigae tataricae, 0.55 g of borneol, 39 g of shikonin and 55 g of radix bupleuri; extracting by using a carbon dioxide supercritical extraction method; drying under reduced pressure; pulverizing into nano dried cream by using a high-energy nano impact mill; and adding functional auxiliary materials and preparing into the Xiao'er Feireping capsule. The disintegration time is shortened remarkably, and the curative effect is remarkably higher than that of Xiao'er Feireping capsules in markets, and the positive effect is achieved.