The invention relates to a production process for bamboo fiber, which comprises steps of material selection, fiber splitting, classification, digestion, reduction, acid pickling, cleaning, dehydration, curing and the like. According to the production process, the whole piece of bamboo is directly processed after being flatten by a special tool under the condition of no cutting and splitting, a mode of bamboo eaten and fiber spit is realized, the production process is free from the limitation of bamboo varieties, bamboo age, bamboo joint and bamboo diameter, a heat-force-chemical multi-field coupling principle is adopted in a bamboo fiber splitting separator to make the machined bamboo fiber longer, finer and more uniform than original fiber, edges and unprocessed bamboo are a few, and an additive is added, so that a product has high folding resistance and flame retardance. The production process is reliable, the resource utilization rate is high, the processing cost is low, environmental pollution is low, the product quality is stable, and the problem of high-efficiency mass production of fine and long bamboo pure fiber is effectively solved.