Compared with glass fiber and carbon fiber, flax fiber is soft. Through proper degumming treatment, reasonable carding process, and needle-punching processing method, it can produce non-woven fabric reinforced fiber felt with quantitative and bulkiness meeting the requirements. At the same time, the fiber damage is small, and the thickening effect is good. As a reinforcing material, it has the advantages of short production process, no weaving, and low processing cost, which is conducive to energy conservation, And environmental protection.