The invention relates to a healthy crawfish feed and a preparation method. The healthy crawfish feed is prepared by selecting various organic raw materials according to a formula, thus providing feed base for producing high-quality crawfish; especially, natural fish meal, earthworm meal, silkworm chrysalis meal, spiral shell meal and bone tankage are added to provide a high-quality animal protein source for the high-quality crawfish, thus enabling the nutrition ingredients of the feed to be more reasonable; due to addition of Chinese herbal medicines, the immunocompetence of the high-quality crawfish is favorably enhanced, the fish flavor of the crawfish is improved, the disease infection possibility can be reduced, and the shell powder can provide calcium for manufacturing crawfish shells; the feed prepared by adopting the formula is complete in nutrition, good in palatability, easy to digest, and fast to absorb, and the crawfish is hale and healthy to grow, strong in disease prevention capability, and high in culture survival rate; and the preparation method is wide in raw material sources, simple and convenient as well as easy to operate, reasonable in formula, and low in cost.