The invention provides a nylon saddle cushion for a railway tank car. The nylon saddle cushion is prepared from materials through squeezing, injection and mold pressing. The materials comprise 67 to 73 percent of PA6 (Polyamide 6), 8 to 10 percent of ethylene-propylene-diene terpolymer, 18 to 21 percent of red phosphorus and 1 to 2 percent of additive, wherein the additive is selected from one or more of a plasticizer, a compatilizer and a flowable agent. According to the nylon saddle cushion, nylon 6 is mainly used as a base material; moreover, the toughening and inflaming retarding modification are carried out on the nylon 6 by adopting the ethylene-propylene-diene terpolymer, a red phosphorus inflaming retarding agent, the additive and the like. A modified material of the nylon saddle cushion has favorable flexibility and impact resistance, reaches a nonflammable level, is ageing-resistant and corrosion-resistant, and has a service life which reaches 10 years or more; the mechanical performance meets a design requirement. Meanwhile, a modified nylon material has favorable machining performance; the field simple, easy and quick processing and shape correction can be realized. In addition, the materials for the saddle cushion provided by the invention can be recycled, and cannot generate pollution to the environment.