The invention provides a method for preparing a palygorskite clay based salt-tolerance super water absorbency composite material, which belongs to the field of composite material preparation. The method comprises the following steps: in a water solution system, stirring palygorskite, 2-acrylamide-2-methyl propanesulfonic acid and acrylic acid as raw materials and N,N'-methylene bisacrylamide as a cross-linking agent at 60-80 DEG C for 2-6 hours to form a gel cross-linking product, cooling down, washing in water, dehydrating, drying and crushing to obtain the palygorskite clay based salt-tolerance super water absorbency composite material. The composite water absorbency material prepared by using the method is good in water absorbency, thermal resistance and salt tolerance, rapid in water absorbency velocity, is applicable to rapid absorbency of rain in a short time in dry and semidry areas, and is a drought-resisting water-retaining composite material with excellent properties. Compared with the prior art, the method is cheap and easy to obtain raw materials, simple in preparation process and green and environment-friendly, and has wide application prospects in such fields as agriculture, forestry, gardening, conservation of water and soil, drought resistance, water conservation and medicine release.