The present invention relates to a health food, which can improve the physical fatigue function, and a preparation method, belonging to the health food field. The health food consists of essentially raw medicines of 1-5 shares of ginseng, 6-10 shares of manyprickle acanthopanax root and 1-5 shares of epimedium in portion. The health food of the present invention is proved by animal experiments that the present invention can obviously relieve physical fatigue and enhance immunity at the same time, which is suitable for persons easy to be fatigue and persons with low immunity, but not suitable for juveniles and children.