The invention belongs to the technical field of a traditional Chinese medicine formula, relates to a bath agent formula for preventing cerebral disease through a bath mode, and especially relates to amedicated bath preparation for auxiliary treatment of spasm-type cerebral palsy. The medicated bath preparation comprises the raw materials of buck grass, Chinese angelica, pawpaw, Ligusticum wallichii, safflower, white peony root, tree peony bark, Radix Rehmanniae Preparata, achyranthcs bidentata blume, sorghum root, bunge pricklyash leaf, mint leaf, dried garlic straw,, gingko shell, peanut shell, Chinese medical stone, and salt. An application is characterized in that the raw materials are prepared to the mixed raw material of the medicated bath preparation, through processing, the prepared liquid medicated bath preparation is placed in a jujube wood container, while in use, the body part, except for the head, of a patient is put into the liquid preparation for bathing, and purified water should be continuously supplemented during a process and the bath temperature is controlled; the formula raw materials are easily available, the combination proportion is scientific, a preparationtechnology of the preparation is matured, control effect is obvious, nontoxic and side effect is generated, the preparation has multiple efficacy for diseases prevention and bathing, bath environmentis friendly, patient can cooperate the treatment, and the application environment is friendly.