The present invention relates to the technical field of food seasoning and more particularly relates to tomato sauce and a preparation method thereof. The tomato sauce is mainly made from the following raw materials in parts by weight: 50-60 parts of tomatoes, 10-15 parts of Chinese herbal medicines, 15-20 parts of shii-take, 15-20 parts of coprinus comatus, 10-15 parts of red dates, 10-15 parts of longan meat, 10-15 parts of sechium edule, 5-7 parts of haws, 4-6 parts of royal jelly, 20-25 parts of maltose, 3-5 parts of fresh ginger and 3-5 parts of garlics. The Chinese herbal medicines are mainly composed of the following raw materials in the same amount: herba gynostemmatis pentaphylli, radix astragali, rhodiola saera, radix et caulis acanthopanacis senticosi and radix notoginseng. The raw materials are squeezed and mixed to prepare the Chinese herbal medicines. The preparation method of the tomato sauce comprises the steps of raw material treating, mixing, boiling, sterilizing, packaging, etc. The tomato sauce is delicious, fragrant and sweet, and rich in nutrition, promotes appetite and digestion, has effects of preventing aging, supplementing qi and tonifying blood, and benefiting minds and warming stomach, can enhance the body immunity, and is free of any food additives, green and health-care.