Abstract: Banana is one of the most popular fruits in the world. The main producing countries are China, Indonesia, Brazil, Ecuador and the Philippines. China's total annual banana production is about 13 million tons. After the banana fruits are picked, the banana pseudostems are usually left on the farm to rot or burn, causing serious environmental pollution and other problems. Due to the high tensile strength and modulus, low density, excellent antibacterial and biodegradable properties of banana fiber, it has great potential in the textile industry, construction, automobile and machinery fields. Banana stem fiber contains a large amount of colloid components such as pectin, hemicellulose and lignin, which limits the application of its fiber. Therefore, it is necessary to remove the colloid from banana stem fiber to meet the requirements of downstream processes. In order to obtain a more effective method, the ethylene glycol and sodium hydroxide are individually selected to degum banana fiber at high temperature. First, the fiber was pretreated and then degummed in ethylene glycol or alkali solution with a high-temperature respectively. The degummed banana fiber was characterized by scanning electron microscope (SEM), Fourier transformation infrared spectrometer (FTIR), X-ray diffractometer (XRD) and thermal gravimetric analyzer (TGA) to analyze the structure and composition of banana fiber under different degumming conditions. The physical and mechanical properties of banana fiber were tested and analyzed, and a more efficient, low-consumption and batch preparation degumming method was optimized according to the amount of chemicals, processing time and fiber properties. The results show that the residual glue rate of high temperature alkali degumming fiber is 3.4%, which is lower than the 8.93% of the traditional alkali method and the 13.13% of the organic solvent degumming method. After degumming, the cellulose content increased to varying degrees, with the organic solvent method and the traditional alkali method increasing to 68.31% and 79.27% respectively, but both were lower than the cellulose content of 87.32% after high temperature alkali treatment. The fiber strength of the traditional alkali treatment is 3.53 cN/dtex, which is lower than that of the organic solvent method and the high temperature alkali method. This is because the fiber is over-degummed under the action of high concentration alkali solution for a long time, causing the depolymerization and damage of cellulose, which reduces the fiber strength. The fiber strength of the ethylene glycol degumming method is 4.72 cN/dtex, and the fiber strength of the high temperature alkali method is 4.43 cN/dtex, which shows that the ethylene glycol degumming method and the high temperature alkali method can better retain the fiber strength during the treatment process. The diameter of ethylene glycol degummed fibers is generally coarse, and the number of fibers above 50 μm accounts for as high as 74%, which shows that ethylene glycol has a poor degumming effect on banana fibers and the fibers are not easy to separate. Compared with the traditional alkali method, number of fibers within 50 μm account for 57%, which is better than that of ethylene glycol degummed fibers, but the fiber diameter is still relatively coarse. The fiber diameter of high-temperature alkali degumming shows an obvious normal distribution, number of fibers within 50 μm accounts for 83% which is the largest proportion. The fiber diameter is reduced overall, which shows that high-temperature alkali degumming effectively reduces the fiber diameter, improves the quality of textile fibers, and is conducive to the spinning process. For the same 500g raw hemp degumming, high temperature alkali method to prepare banana fiber requires at least 1.96kg of chemical reagents. Compared with the traditional alkali method and the organic solvent degumming method, the amount of chemicals used in the high temperature alkali method to treat the fiber is reduced by 46.6% and 81.3% respectively, and the time is shortened to 1.75 h. The study shows that the high temperature alkali degumming process is more efficient, low consumption, and is more suitable for banana fiber batch preparation.