NOVELTY - Method for synchronously producing straw nano-cellulose and bacterial cellulose using sweet Sorghum involves (a) squeezing sweet Sorghum stalks, performing steam explosion, enzymolysis, homogenization, adding acetic acid solution to nano-cellulose, performing acidification treatment, dissolving acidified product in chitosan, and drying product to obtain nano-cellulose mixed film, and (b) inoculating Acetobacter xylinum into fermentation medium, performing fermentation to obtain bacterial cellulose film, and washing, incubating and drying product.    USE - The method is useful for synchronously producing straw nano-cellulose and bacterial cellulose using sweet Sorghum (claimed).    ADVANTAGE - The method enables to produce product which has high tensile strength.    DETAILED DESCRIPTION - Method for synchronously producing straw nano-cellulose and bacterial cellulose using sweet Sorghum involves (a) rolling and squeezing sweet Sorghum stalks to obtain Sorghum stalks juice and residues, performing steam explosion of Sorghum stalks juice at 2-6 MPa, washing, and filtering steam exposed product, performing enzymolysis using laccase, xylanase and cellulase, filtering enzymolyzed product to obtain straw fiber, performing homogenization, and modification treatment on straw fibers at 50-150 MPa to obtain aqueous solution of nano-cellulose, adding acetic acid solution to nano-cellulose, performing acidification treatment, dissolving acidified product in chitosan, and washing and drying dissolved product to obtain nano-cellulose mixed film, (b) adding yeast, peptone, citric acid, disodium hydrogen phosphate, magnesium sulfate, and hydroxymethyl chitosan to fermentation medium, inoculating Acetobacter xylinum into fermentation medium, performing fermentation to obtain bacterial cellulose film, washing bacterial cellulose film using 2-4 times distilled water and immersing in 0.1-0.2 mol/l sodium hydroxide solution, incubating mixture at 60-90 degrees C for 40-100 minutes, and drying incubated product at 60-80 degrees C.