The invention discloses chicken feed and a preparation method thereof. The chicken feed is prepared from, by weight, 40-60 parts of corn, 10-20 parts of wheat, 3-8 parts of shell powder, 4-8 parts of earthworm powder, 10-15 parts of bean cake, 5-10 parts of pea meal, 0.1-0.4 part of table salt, 1-5 parts of distillers' grains, 0.2-0.8 part of citric acid, 1-3 parts of Kalimeris, 1-4 parts of Chinese chives, 2-5 parts of black locust leaves, 0.1-0.3 part of sticktight, 0.2-0.5 part of pomegranate bark, 0.3-0.7 part of dried frunus mume, 0.2-0.5 part of radix isatidis, 0.2-0.5 part of pseudo-ginseng, 0.2-0.5 part of rhizoma paridis, 0.2-0.5 part of folium isatidis, 0.4-1 parts of herba leonuri, 3-7 parts of seaweed meal and 1-4 parts of trace additives. According the physiological properties of growth and development of laying hens, the formula and compatibility of the feed are optimized, the feed is balanced in nutrient and easy to digest and absorb, can promote the normal growth and development of the laying hens and enhance the immunity of the laying hens, effectively improves the quality of chicken meat, increases the laying rate of the laying hens and has quite good popularization value.