The invention discloses a reserve sow mixed feed capable of increasing production performance of sow and a preparation method. The feed is prepared according to physiological characteristics of reserve sow, a plurality of raw materials are employed for combining, the nutrition enables complementation, and the feed is a daily food designed according to balance of amino acid, balance of calcium phosphate and balance of electrolyte. According to the invention, natural traditional Chinese medicines such as root of large-flowered skullcap and semen cuscutae are added for increasing the reactivity of pituitary gland to LRH and reactivity of ovary to LH, and increasing hypothalamus-pituitary-ovary luteinizing function to promote growth and maturity of the reserve sow reproduction system, so that body maturity and sexual maturity of sow enable synchronization, and sow can have a plurality of piglets with strong body. No antibiotic is added in the feed, natural Chinese herbal medicine additives such as pasque flower, coptis, phellodendron and ash bark enable health care to alimentary canal, reserve sow intestinal tract health is improved, immunity is increased, sow physique is enhanced, production performance of sow in a production period is increased, hereditary capacity of reserve sow can be performed with maximum limit, thereby, sow can have more and stronger piglets.