The invention discloses a conditioning plaster formula with a weight reducing function, which consists of the following components in percentage by weight: 80 to 90 percent of wood vinegar extract and10 to 20 percent of traditional Chinese medicine powder; and the traditional Chinese medicine powder is prepared from the following components in parts by weight: 10 parts of prepared liquorice roots, 3 parts of radixet rhizoma rhei, 3 parts of largehead atractylodes rhizome, 3 parts of peach seeds, 3 parts of Chinese hawthorn fruits, 3 parts of mirabilite, 3 parts of sappan caesalpinia wood, 3 parts of oriental waterplantain rhizome, 3 parts of dahurian angelica roots, 3 parts of redroot gromwell roots, 3 parts of common cnidium fruits, 3 parts of hemp fimble seeds, 3 parts of garden balsamstems, 2 parts of immature bitter orange, 2 parts of officinal magnolia barks, 2 parts of gizzard-membrane, 2 parts of aloe, 1 part of purging croton fruits and 1 parts of senna leaves. The conditioning plaster is added with the weight-reducing traditional Chinese medicine components, wherein the traditional Chinese medicine formula is combined with the wood vinegar extract, the effect of the woodvinegar extract and the weight reducing effect of the traditional Chinese medicines are combined together and play the role of promoting weight reduction, so that the effect of weight reduction is remarkably increased, and the conditioning plaster can be used by people at any time.