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This invention relates to the technical field of hoses, and more particularly to a reinforcing material, its preparation method, and its application. The material composition includes at least one thermoplastic polyolefin, 80-120 parts by weight of the thermoplastic polyolefin, 15-20 parts by weight of fiber, and grafted material. The screw compression section and mixing section of the mixture are equipped with pins, and the screw as a whole is provided with helical grooves. This invention first discovered the relationship between the fiber content in the reinforcing material composition with a fiber-reinforced phase and the bending radius and strength of the hose product. Furthermore, by appropriately increasing the fiber content and optimizing the preparation method, the hose product with the reinforced structure achieves higher strength, while simultaneously maintaining its bending radius near the minimum level, providing an effective material formulation and preparation method for reinforced hose products.