The invention discloses an auxiliary guide wheel abrasion part which is prepared from modified thermoplastic materials by injection molding or compression molding. The modified thermoplastic materialscomprise, by weight, 100 parts of matrix resin, 0.1-0.5 part of antioxidants, 0.1-20 parts of fire retardants, 0.1-10 parts of abrasion-resistant agents and 0.1-3.5 pasts of additives. The auxiliaryguide wheel abrasion part is directly injected and molded without extruding and granulating, and modified additives are added by a master batch mode. The thermoplastic materials have a low friction coefficient and a flame-retardant function and are excellent in abrasion resistance and simple in manufacturing process. The prepared abrasion part wraps an outer ring of an aluminum alloy support, abrasion of the support and a cement track beam caused by direct contact between the support and the cement track beam can be avoided, and the running noise of a vehicle is low. The abrasion part is convenient to replace and low in cost, labor-hour consumption is reduced by 60%, the cost is reduced by 90%, and repair and maintenance cost can be effectively reduced.