The invention relates to a preparation method for a porous nickel titanium / hydroxyapatite composite material, and belongs to the technical field of biomedical material preparing. The preparation method for the porous nickel titanium / hydroxyapatite composite material comprises the steps that firstly, nickel titanium mixed powder is obtained by mixing nickel metal powder and titanium metal powder evenly; secondly, the obtained nickel titanium mixed powder is mixed with hydroxyapatite powder, and nickel titanium / hydroxyapatite powder is obtained; thirdly, after the nickel titanium / hydroxyapatite powder is mixed with ammonium bicarbonate pore forming agent powder, a briquetted pressing blank is formed through mechanical compression and then put into a discharge plasma sintering furnace to be sintered; and fourthly, after sintering is completed, the briquetted pressing blank is cooled to the room temperature along the furnace, then the hyper-elastic porous nickel titanium / hydroxyapatite composite material is obtained. The porous nickel titanium / hydroxyapatite composite material prepared through the method has the advantages of being controllable in pore parameter, low in elasticity modulus, good in mechanical adaptability and the like; in addition, the porous nickel titanium / hydroxyapatite composite material is endowed with good biological activity and synosteosis capacity, so that the composite material is closer to the structure and functions of a human bone, and good biological adaptability is achieved; the material is particularly suitable for plastic surgery medical apparatus and instruments, marrow cavity implants and the like.