The invention provides a high shrinkage nylon fiber, which is prepared by melting and spinning a single slice. The boiling water shrinkage of the fiber is 20 to 50%. After the fiber is heated for 15 minutes at a temperature of 160 DEG C, the dry heat shrinkage of the fiber is 3 to 10%. The thermal shrinkage stress of the fiber is 0.1 to 0.3 cN/dtex; and on the thermal shrinkage stress test curve of the fiber, the temperature is 150 to 160 DEG C, when the thermal shrinkage stress is maximal. The fiber has high boiling water shrinkage, and is suitable for the development and manufacturing of compact materials with a fluffy surface.