The invention belongs to the field of daily necessities and in particular discloses liquid toothpaste and a preparation method thereof. The liquid toothpaste is prepared from xylitol, vitamin C, cetylpyridinium chloride, sodium fluoride, natural betaine, sodium phytate, traditional Chinese medicine extracting solution, lauryl sodium sulphate, sodium lauroyl sarcosine, glycerol, sorbitol, silica, essence, a freshener, antiseptic, a sweetening agent, edible gum and water. The toothpaste is in a liquid state, so that active ingredients in the liquid toothpaste product can smoothly reach each surface of an oral cavity, quickly go deep into gaps of teeth and cover the whole teeth, the traditional Chinese medicinal extracting solution and cetylpyridinium chloride in the formula can be matched with other components, sterilization can be effectively carried out, bacteria growth can be inhibited, dental plaque can be eliminated, caries can be prevented, gingival and periodontal problems such as gingival bleeding, gingival pain, gingival swelling and ozostomia can be effectively solved, the oral cavity is protected, and teeth are whitened and healthy.