Method for returning winter rape cultivated by tobacco stem sterilization organic fertilizer to field

The invention relates to the technical field of tobacco planting, in particular to a tobacco stem sterilization organic fertilizer cultivated winter rape returning method which comprises the steps that tobacco stems are smashed, smashed tobacco stem fragments are transferred to a tobacco stem stack retting site and then stacked in a layered mode, a decomposition agent and urea are scattered between every two adjacent layers of tobacco stems, and the tobacco stem stack retting site is formed; and mixing a fumigant with the tobacco stalks after decomposition and fermentation, and fumigating and sterilizing the tobacco stalks under the action of the fumigant, so as to obtain the tobacco stalk organic fertilizer. Cultivating winter rapes in the tobacco field through organic fertilizer, turning and pressing the winter rapes back to the field when the winter rapes reach a full-bloom stage, and finally preparing soil for planting. According to the method, the field power of the tobacco field is fertilized, tobacco s