NOVELTY - A composition comprises Bacillus ( Bacillus sp.) under preservation number (CGMCC No. 5971), Acinetobacter lwoffii under preservation number (CGMCC No. 5973), and fluorescent Pseudomonas (Pseudomonas fluorescens) under preservation number (CGMCC No. 5974).    USE - As composition for producing cellulose ester film additive for optical use (claimed).    ADVANTAGE - The biological bacterium composition improves the existing technology for preparing fiber, reduces the reaction time, improves the purity and yield of the prepared fiber, so that the technique can be applied in large scale in the actual production. The method does not pollute the environment, waste liquid is directly converted into organic fertilizer, allows zero discharge and zero pollution. The biological treatment process protects the fiber, compared with the traditional chemical method, has low production cost and high economic benefit; saves energy and is environmentally-friendly.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of cellulose additive involving: configuration of bacteria liquid: configuration of an aqueous solution of composition, where the weight ratio of Bacillus bacilli: Acinetobacter lwoffii and (Pseudomonas fluorescens is 2-3: 1-2: 1-2; 2) raw material processing: taking woody raw peeled slices, cutting the herbal raw material in a cutting section, soaking the raw material in a pool swelling, 3) preparing the seal coat of fiber by: mitigating the swelling of the thread raw material, crushing and/or grinding, soaking the solution of the raw materials in the prepared bacterial liquid; sterilizing: taking the biodegradable raw material from bacteria liquid, draining, steam sterilization; fiber obtaining: carrying out the sterilized raw material to a section of the coarse grinding for a first time period to give fiber bundle; carrying out a second section of the fine grinding to make fiber beam; screening, filtering after a period of grinding and the slurry after the second fine grinding of the fiber bundle, and then grinding to make it into single fiber, sterilizing: soaking the prepared fiber in warm water, drying, sterilizing, and grinding the sterilized fiber into cellulose fibers, as additive.