The invention relates to a low-temperature-resistant high-flow nylon composition for a ribbon and a preparation method of the low-temperature-resistant high-flow nylon composition. The low-temperature-resistant high-flow nylon composition comprises the following components in parts by weight: 100 parts of PA66, 10-30 parts of a flexibilizer, 10-30 parts of a flow modifier and 0.5-2 parts of a lubricant. The preparation method of the low-temperature-resistant high-flow nylon composition comprises the following steps: firstly, putting the PA66, the flexibilizer, the flow modifier and the lubricant into a high-speed mixer in parts by weight to mix for 2-5 minutes, and then, discharging; then, putting the mixed materials into an extruder from a primary feeding hole of the double-screw extruder; and finally, carrying out melt extrusion and pelletizing to form the nylon composition, wherein the temperature of the whole pelletizing process is controlled to 250-280 DEG C, the rotation speed of a screw rod is controlled to 350-400 RPM. The nylon composition disclosed by the invention not only has good drawing force, but also has excellent low temperature resistance and processing fluidity, and can be used for producing the low-temperature-resistant high-flow nylon ribbon very well.