NOVELTY - Producing cotton involves decomposing microorganism of straw pole by adding with water and microbial agent and then performing a biochemical reaction after adding cotton fiber. The obtained material is dried and then the obtained material is kept in wet or half-dry state conditions, where the material consumption range is less than N = 100000, and N value is the unit weight of cotton fiber needed for multi-unit weight of biological agent in the reaction of numerical value. The obtained material is bleached and then the bleached material is washed with water.    USE - Method for producing cotton (claimed).    ADVANTAGE - The method enables to produce cotton in cost-effective manner, and with low energy consumption.    DETAILED DESCRIPTION - Producing cotton involves decomposing microorganism of straw pole by adding with water and microbial agent and then performing a biochemical reaction after adding cotton fiber. The obtained material is dried and then the obtained material is kept in wet or half-dry state conditions, where the material consumption range is less than N = 100000, and N value is the unit weight of cotton fiber needed for multi-unit weight of biological agent in the reaction of numerical value. The obtained material is bleached and then the bleached material is washed with water. The washed material is boiled with alkali and then the obtained material is bleached. The bleached material is washed with water and then the washed material is dehydrated to obtain dried material. The dried material is bleached and then the bleached material is washed with water. The obtained material is processed biochemically into good cotton bleach solution at room temperature. The obtained material is stirred and then the stirred material is washed to reduce the chlorine content to 20%. The washed material during secondary bleaching and washing is kept in alkali liquid (150 g\L) at 25 degrees C. The obtained material is boiled at 140 degrees C for 0.1 hours and then boiled material is cooked for 8 hours at 0.15 megapascal. The obtained cotton fiber is bleached for 10 minutes.