The invention relates to a dry-typed long-term storage method for sweet sorghum stems and belongs to the technical field of agriculture. The storage method crashes the collected sweet sorghum stems into particles by a kneading grinder, evenly mixes dimethyl fumarate or trichloroisocyanuric hydrogen uric acid, dries and places the mixture in drying and ventilation position to carry out long-term storage. The storage method can acquire long-term and effective storage effect; by mixing dimethyl fumarate or trichloroisocyanuric hydrogen uric acid, the loss of effective sugar content of the sweet sorghum in the particles of sweet sorghum stems can be minimized in the process of drying. The storage method has the advantages of good storage effect for sweet sorghum stems, low consumption of production capacity and simple technology, which can provide annual raw material supply for the production of bio-ethanol prepared by sweet sorghum stems.