The invention discloses an in-situ adipocyte composite inhibitor for the local weight loss and body care of human bodies and a preparation method thereof. The compound (composite inhibitor) comprises the following bulk drugs: anti-NPY monoclonal antibodies, alpha-aminoethanesulfonic acid, mannitol, enol phosphatidylcholine, sodium deoxycholate, trans-10, cis-12conjugated linoleic acid, docosahexenoic acid, berberine, emodin, sodium bicarbonate and injection water. The compound of the invention can synchronously inhibit the propagation and the differentiation of preadipocytes, accelerate and promote the decomposition and the conversion of fats in mature adipocytes, effectively reduce the quantity of in-situ and newborn mature adipocytes, regulate the expression, the synthesis and the secretion of relevant adipogenic genes and adipocyte growth factors from the gene level and the like, and control the propagation and the fat synthesis of the adipocytes at the source; and, additionally, the absorption utilization rate of the compound is improved through local administration, so the compound has the rapid and efficient weight loss effect.