The invention discloses idesia polycarpa flower compound essential oil promoting wound healing and a preparation method thereof and aims at solving the problems in the prior art that a medicine promoting wound healing is poor in effect. The compound essential oil is prepared from the following raw materials in parts by weight: 30-40 parts of idesia polycarpa flower essential oil, 2-5 parts of radix notoginseng extract, 1-3 parts of ganoderma lucidum extract and 2-5 parts of polypropylene glycol. The preparation method of the compound essential oil comprises the following steps: weighing the raw materials according to parts by weight; uniformly mixing the idesia polycarpa flower essential oil with polypropylene glycol, then adding radix notoginseng extract and ganoderma lucidum extract, and uniformly mixing, so that the compound essential oil is obtained. The compound essential oil disclosed by the invention has definite wound healing promoting effect and is safe and non-irritant, a scar cannot be produced after healing, objectionable odor cannot be produced, and the compound essential oil is easily acceptable to patients.