Abstract: Abstract: Banana is one of the four fruits. The annual banana production is 9×106 t in China, and the banana stem waste is 2.7×107 t. At present, the traditional way to process the banana stem, such as artificial cut, natural decay and dry burning method, is still adopted in the banana planting area in China. These methods not only cause time consuming, high cost and low benefit, but also probably lead to environmental pollution, disease spread, waste of resources, fire accidents and other problems. Meanwhile, banana stalk contains high-quality plant fiber that is lightweight and with strong permeability, which has high economic value and is suitable for the production of medium and top-grade products, such as suits, shirts, ties, and various decorations, as well as fine paper. But nowadays the researches most have focused on the fiber extraction and application of pineapple, corn stalk and cotton stalk, etc. Based on the above issues, we design the fully feeding and movable combined machine for banana stalk fiber extraction, which is mainly composed of conveying device, feeding device, rolling device, fiber extracting device, discharging device, output device and collection roller. Before the machine works, the banana stem need to be cut into slices and the electric motor of the model machine need to run without load first. After the machine operates steadily, the slices of banana stem are put on the conveying device. With the transmission of the electric motor, the slices of banana are brought into the feeding device by which the banana stem will be fed continuously. Then the banana stem will be sent into the rolling device where the banana stem will be pre-squeezed water out and smoothed, and then it is put into the space between scraping roller and scraping blocker. The minimum distance is 2 mm between scraping roller and scraping blocker. The scraping roller rotates with high speed by means of electric motor's power through conveyor belt. The constant hit of the scraping knife makes the stem succulent part around the banana stem fiber be disintegrating slag and separated from the stem fiber. Meanwhile the disintegrating slag will be discharged from the outlet of impurity along the tangent direction of scraping knife's move by wind force that is created by scraping roller's rotation. After that, banana stem fiber is brought into the crushing device by its own gravity. Then the remaining moisture of stem fiber is exhausted by the discharging device, and stem fiber is output through the output device. At last, the banana stem fiber is collected by people for further processing. The sample test results showed as below: the output was 206.6 kg/h, the extraction rate of stem fiber was 90.4%, the impurity rate was 16.2%, and the energy consumption for extracting 100 kg banana stem fiber was 22.3 kW·h. The machine meets the agronomic production and raw material standards of related industries. The machine has excellent performance, is easy to operate, and works stable and safe. The machine can bring significant ecological benefit to the banana land of main production areas, and will have a promising prospect of application and spreading in the banana planting areas in the south of China.