The invention belongs to the technical field of feed, particularly relates to egg production stage mixed feed for increasing the rate of healthy chicks of egg breeding chickens and relates to a preparation method of the feed. The mixed feed is mainly prepared from, by weight, 50-65 parts of grains, 15-25 parts of soymeal, 1-5 parts of corn protein flour, 1-6 parts of rice bran meal, 2-6 parts of alfalfa meal, 1-3 parts of vegetable oil, 0.35-0.7 parts of amino acid, 0.05-1 part of compound enzyme, 0.05-2 parts of probiotics, 0.01-0.03 parts of 25-hydroxycholecalciferol, 0.01-0.3 part of beta-carotene, 0.03-0.08 part of compound organic trace elements and 1 part of compound premix. By means of sufficient and efficient energy, amino acid, mineral substance nutrients and probiotics, the requirement for the highest egg production potential of the egg breeding chickens can be guaranteed, the egg production rate is high, egg weight is appropriate, and the rate of the healthy chicks of the egg breeding chickens is high.