The invention belongs to the field of daily necessities, and specifically discloses a liquid toothpaste and a preparation method thereof. The liquid toothpaste is composed of xylitol, vitamin C, cetylpyridinium chloride, sodium fluoride, natural betaine, sodium phytate, traditional Chinese medicine extract, sodium lauryl sulfate, sodium lauroyl sarcosinate, glycerin, sorbitol , silicon dioxide, essence, cooling agent, preservative, sweetener, edible gum and water. The toothpaste exists in a liquid form, so that the active ingredients in the product can smoothly reach the various surfaces of the oral cavity and quickly penetrate into the crevices of the teeth, covering the entire teeth. It can effectively sterilize, inhibit bacterial growth, remove dental plaque, prevent caries, and can effectively improve gum and periodontal problems such as bleeding gums, gum pain, gum swelling, and bad breath, protect the oral cavity, and make teeth white and healthy.