The invention relates to a preparation method of a nonalcoholic ageratum summer-heat clearing liquid oral preparation. The raw materials are chosen according to the raw materials which are specified by 'ageratum summer-heat clearing water' recorded by ministerial traditional Chinese medicine standard and the dosage proportion thereof. The particular method of the invention is as follows: patchouly, elsholtzia haichowensis, angelica dahurica, perilla leaf, rhizoma atractylodis, clove, dried orange peel, shell of areca nut, rhizoma pinellinae praeparata, tuckahoe, ginger and liquorice are chosen; firstly, the patchouly, the elsholtzia haichowensis, the angelica dahurica, the perilla leaf, the rhizoma atractylodis, the clove, the dried orange peel and the ginger which contain volatile oil are extracted to obtain the volatile oil; solubilizer is added into distilment to lead the volatile oil and aromatic water to be well blended; the water part is steamed with water, and clear paste is remained; the residue after the volatile oil is extracted, shell of areca nut, rhizoma pinellinae praeparata, tuckahoe, and liquorice are extracted by ethanol; after the ethanol is volatilized, the two clear pastes are combined and are blended with the volatile oil; finally flavouring agent and specified amount of water are added to prepare nonalcoholic ageratum summer-heat clearing liquid oral preparation. Compared with ageratum summer-heat clearing liquid which contains 40-45% of ethanol recorded by ministered standard, the invention does not contain ethanol, thus avoiding the side effect such as irritating gastrointestinal tract and the like, being accepted by patients easily, better taking the healing effect, expanding the scope of treated subjects. In addition, compared with the original ageratum summer-heat clearing water, the amount of the ethanol is reduced in the course of production, and the cost is reduced.