The present invention discloses osmanthus fragrans honey and a preparation method thereof, the osmanthus fragrans honey comprises, by weight, 70 parts of honey, 40 parts of osmanthus fragrans, 1 part of spina date seed, 1 part of radix rehmanniae recen, 1 part of almond, 1 part of black sesame, 1 part of spatholobus suberctu, 2 parts of radix polygonati officinalis, 2 part of dandelion and 1 part of nisin; and the preparation method is as follows: S1, osmanthus fragrans is pretreated, to be more specific, the osmanthus fragrans, the spina date seed, the radix rehmanniae recen, the almond, the black sesame, the spatholobus suberctu, the radix polygonati officinalis and the dandelion are washed with water and dried in the air, and the osmanthus fragrans is crushed into osmanthus fragrans powder; S2, the traditional Chinese medicine raw materials of the spina date seed, the radix rehmanniae recen, the almond, the black sesame, the spatholobus suberctu, the radix polygonati officinalis and the dandelion are soaked with clear water or pure water for 20-90 minutes, and water for soaking is 0.4-3 times of the amount of the raw materials; S3, the soaked traditional Chinese medicine raw materials and soaking medicinal liquid are added into a decocting container, the decocting container is covered with a cover for codecocting; and S4, first, the traditional Chinese medicinal liquid in the decocting container is boiled with strong fire, and then decocted with slow fire for 60 to 150 minutes, and during the decocting, 4-15 times of stirring is required.