The method for synthesizing NiTi marmen porous body material is characterized by that it uses Ti powder and Ni powder as raw material, and includes the following steps: uniformly mixing the above-mentioned raw materials, mixing them with adhesive in mixing machine, granulating to obtain feeding material, injecting to obtain blank piece, soaking said blank piece in gasoline to remove grease, drying and placing the blank into vacuum furnace to make thermal grease removal, finally connecting one end of blank with W spiral in flame igniter, placing it into vacuum reaction synthesizer, when the degree of vacuum is higher than 1X10(-2)Pa, starting heating, after the temp. is up to defined value, starting flame igniter so as to produce self-spreading high-temp. synthesis reaction to obtain finished product.