The invention discloses a preparation method of smoked chicken. The preparation method specifically comprises the following steps of preparing a nutritional material solution for further use, selecting chicken after feather removal, pretreating, rolling, rubbing, preserving, putting into the diluted nutritional material solution, boiling, and hanging and airing for the first time; airing, burningpine branches, gynostemma pentaphyllum leaves and tea tree roots at the temperature of 100 to 120 DEG C, and smoking for 3 to 5min; sending the smoked chicken after feather removal into an airing warehouse, airing for 10 to 14h at the temperature of 10 to 15 DEG C, and delivering out of the warehouse, so as to obtain the finished product. The preparation method has the advantages that by adding multiple types of medicinal materials into the nutritional material solution, the flavor of the chicken meat is particular, and the functions of promoting appetite and tonifying the spleen, promoting appetite, removing wind, damp and cold Qi, and refreshing mind are realized; the medicinal effect is realized, and the flavoring function is also realized; the chicken meat contains rich nutrients, theflavoring is thorough, the meat odor is thoroughly removed, the mouth feel is fine, the taste is delicious, the meat is smooth, the bone is delicious, and the dietary therapy effect is good.