The invention discloses a method for making short tobacco stalks which are shorter than 20mm into expanded cut stalks and relates to a production method of tobacco industry. The method adopts a processing technology of flattening stalks after fully soaking, and then the stalks are cut into threads, and dry ice expanding is carried out. The temperature of the water for soaking is 45 plus or minus 5 DEG C, while the soaking time is 10-15 minutes; the optimal stalk flattening gap is 0.50mm plus or minus 0.02mm, and the optimal cutting width is 0.16mm plus or minus 0.02mm. According to the evaluation results of all aspects, short tobacco stalk that is shorter than 20mm can be made into expanded cut tobacco with preferable appearance and good smoking quality; and a great amount of the resource of the short stalks discarded can be effectively used by adopting the technique of the invention, the smoking quality of the cigarette products can be obviously improved when the technique is applied to the cigarette products, and the method changes waste into valuable.