The invention discloses a traditional Chinese medicine preparation for treating periodontitis and a preparation method and application thereof. The traditional Chinese medicine preparation for treating periodontitis is prepared from, by weight, herba hedyrotidis diffusae, galeola faberi, the root of stellaria alsine, albizia flowers, Chinese roses, Oroxylum indicum Vent, phyllagathis fordii, radix sophorae subprostratae, the root of stellaria yunnanensis, herba crotalariae, moleplant seeds and Jasminum humile L. In the preparation process, galeola faberi, the root of stellaria alsine, phyllagathis fordii, the root of stellaria yunnanensis and herba crotalariae are subjected to aqueous extraction, Oroxylum indicum Vent and moleplant seeds are subjected to alcohol extraction, Jasminum humile L and herba hedyrotidis diffusae are smashed, and albizia flowers and Chinese roses are twisted to obtain juice. All the crude medicine achieves the synergistic effect, and the functions of being rapid in effect taking, definite in curative effect, high in safety and easy to apply are achieved. The preparation process is simple, environment friendliness is achieved, the symptoms such as gingivitis, bleeding, alveolar resorption, gomphiasis and tooth displacement and chewing weakness caused by periodontitis can be effectively relived, no toxic or side effect exists, and a new choice is provided for clinically relieving various symptoms caused by periodontitis.