The invention discloses a traditional Chinese medicine probiotic fermentation extract for improving oral cavity problems and a preparation method thereof. The traditional Chinese medicine probiotic fermentation extract is prepared by fermenting a traditional Chinese medicine extracting solution obtained by extracting a traditional Chinese medicine formula with saccharomycetes and lactobacillus; before fermentation and/or after fermentation is completed, a flavor regulator is added; and the traditional Chinese medicine formula comprises the following components in equal parts by weight: radix rehmanniae recen, prepared rehmannia root, radix asparagi, radix ophiopogonis, folium eriobotryae, radix scutellariae, dendrobe, fructus aurantii, honey-fried licorice root, oriental wormwood and agastache rugosus. The traditional Chinese medicine probiotic fermentation extract is converted by probiotics in advance, so that the content of effective components can be increased, or part of other components can be converted into effective components, and the defects that the traditional Chinese medicine is not converted in advance, the action time of an oral product in the oral cavity is short and the action is limited are overcome. Meanwhile, the problems of insufficient taste, smell and color and the like when the traditional Chinese medicine extract is applied to oral hygiene products can be solved. The traditional Chinese medicine probiotic fermentation extract provided by the invention can be applied to oral hygiene products and oral health products.