The invention belongs to the field of daily life articles, which in particular relates to a method for preparing a refreshing agent for the oral cavity. The refreshing agent comprises the main components of green tea, menthol, aloe, coptis root, skunk bugbane, baikal skullcap root and borneol. The method comprises the following steps: firstly, cutting up the green tea, the aloe, the coptis root, the baikal skullcap root and the skunk bugbane according to a certain proportion, mixing evenly, adding into water, decocting, clarifying, filtering, concentrating filtrate by reverse osmosis, adding a certain amount of ethanol, a certain amount of menthol and a certain amount of borneol, heating, stirring, dissolving, then adding processed Tween-80, mixing, sterilizing and putting into a sprayingbottle. The invention takes the green tea, the menthol, the aloe and the like as main materials, has better effect in the aspects of eliminating the peculiar smell of the oral cavity, sterilizing theoral cavity and diminishing inflammation and has lower preparation cost, no side effect and convenient use.