The invention belongs to the technical field of fish culture and discloses immunity enhanced type grass carp extruded feed pellets and a preparation method thereof. The immunity enhanced type grass carp extruded feed pellets are prepared from rice flour, fish meal, bean cake powder, wheat bran, sweet potato powder, table salt, auxin, calcium hydrogen phosphate, bentonite, lysine hydrochloride, anantioxidant, soybean oil, high strength flour, calcium dihydrogen phosphate, choline chloride, a mould inhibitor, the antioxidant, natural xanthophylls, a premix, herba acalyphae, argy wormwood, plantain herb, european verbena, galla chinensis, fructus meliae and a feed additive. The extruded feed pellets provided by the invention can float on water as the volume is increased due to the porosity;as the processing temperature is relatively high, the extruded feed pellets can be better disinfected and sterilized; the extruded feed pellets are partly gelatinized, keep nutrition to the maximum and are easily digested and absorbed by fishes, and the feed conversion rate is greatly increased; and after the extruded feed pellets are dried, the water content can be lowered to 6-8 times, and the preservation period can be effectively prolonged.