The invention belongs to the technical field of daily disinfection, and particularly relates to a plant disinfectant and a preparation method thereof. The plant disinfectant is prepared from the following raw materials in percentage by weight: a rose extract, a sweet-scented osmanthus extract, a violet extract, a jasmine extract, a lemon extract, a rose extract, a dianthus chinensis extract, a convallaria majalis extract, a crape myrtle extract and the balance of water. The traditional Chinese medicine disinfectant is prepared from the following raw materials in percentage by weight: a honeysuckle flower extract, a wild chrysanthemum flower extract, a scutellaria baicalensis extract, a garlic extract, a tulip extract, a rheum officinale extract, a pseudolarix amabilis extract, a radix sophorae flavescentis extract, a cortex phellodendri extract, a eucalyptus robusta leaf extract, a virion extract, a herba schizonepetae extract and the balance of water. The disinfectant is prepared by mixing a plurality of plants and traditional Chinese medicines, is prepared from pure natural raw materials, has no pollution to the environment, has a good bactericidal effect, has no toxicity and no irritation in smell, and does not generate drug resistance after being used.