The invention belongs to the field of leek flower sauce, and discloses a leek flower sauce which is prepared from the materials of, by weight: 100 parts of pollution-free leek flower, 8 parts of salt, 4 parts of ginger, 2 parts of fresh prickly ash seed, 10 parts of apple, 20 parts of green pepper, 4 parts of garlic, and 2 parts walnut kernels. The preparation process of the leek flower sauce mainly comprises the steps that: leek flower is picked and cleaned by washing; salt, ginger, fresh prickly ash seed, apple, green pepper, garlic, and walnut kernels are mixed and crushed with the leek flower; the materials are blended, and bottled; sterilization, sealing, disinfection, and packaging are carried out, such that the product is obtained. The components are, by weight: 100 parts of pollution-free leek flower, 8 parts of salt, 4 parts of ginger, 2 parts of fresh prickly ash seed, 10 parts of apple, 20 parts of green pepper, 4 parts of garlic, and 2 parts walnut kernels. According to the leek flower sauce and preparation process provided by the invention, pollution-free leek flower is adopted. The sauce has a delicious taste, and is healthy for eating.