The present invention provides a method for preparing a NiTi spring/carbon nano-tube/polyurethane composite material. The method comprises: (1) respectively dissolving carbon nano-tubes and polyurethane elastomer particles in an organic solvent, and adding the carbon nano-tube solution to the polyurethane elastomer solution in a dropwise manner, wherein the carbon nano-tube content is 0.1-1 wt%; (2) placing the mixed solution obtained in the step (1) in a vacuum drying oven to exhaust gas, wherein the temperature is maintained at 70-100 DEG C, and the time is 0.5-1.5 h; (3) placing a NiTi alloy spring into acetone, and carrying out ultrasonic cleaning; (4) slowly embedding the NiTi alloy spring into the mixed system obtained in the step (2); and (5) removing the solvent in an air blasting constant temperature oven, wherein the temperature is maintained at 70-100 DEG C, the molding time is 24-48 h, and the product is obtained after the solvent is completely removed. According to the present invention, the method has characteristics of simple preparation process, good moldability and low cost; and the prepared composite material exhibits good damping property and good shape memory recovery property.