The invention relates to a high-speed railway material, in particular to a glass fiber reinforced nylon material for a high-speed railway system and a preparation method thereof. It is difficult to further increase the railway transportation speed and ensure the safety of the high-speed transportation in the prior art. The glass fiber reinforced nylon material comprises the following components in parts by weight: 45-64 parts of nylon resin, 30-35 parts of glass fiber, 5-20 parts of compatilizer, 0.1-0.5 part of antioxidant and 0.1-0.5 part of nucleating agent. The preparation method comprises the following steps: accurately weighing the raw materials according to the parts by weight; evenly mixing the nylon resin, compatilizer, antioxidant and nucleating agent, and putting the mixture in a double screw extruder; adding the glass fiber; and extruding at 230-285 DEG C for 1-3 minutes, wherein the rotation speed of the host machine is 350-450 revolutions per minute; and after the extrusion, cooling, drying, pelleting and carrying out color mixing to obtain the glass fiber reinforced nylon material. The glass fiber reinforced nylon material has the advantages of low density, light weight, obvious effects of damping and noise reduction, and low cost, and is convenient to produce and process and easy to form.