The invention discloses a macromolecular material with a water-response bidirectional-reversible shape memory function and a preparation method therefor. According to the material, a hydrophilic crystalline material serves as a reversible drive phase of a bidirectional-reversible shape memory material; when the
humidity of the material is improved, the hydrophilic crystalline material is dissolvedgradually, molecular chains curl up, and the material shrinks; when the
humidity of the material is lowered, dissolved hydrophilic crystalline chain segments are subjected to oriented crystallizationalong an external force or internal force, and the material stretches; and the material can achieve reversible
shape change under the condition of wet state and dry state circulating. The involved water-response bidirectional-reversible
shape memory polymer is simple and diversified in preparation method, and different
processing forms and shapes can be designed according to actual needs. Water serves as a stimulus for triggering
shape change, so that the material has the characteristics that the source is wide, and the triggering mode is simple, convenient and safe; and the material has a relatively
high potential application value in the fields of biomedical devices,
textile materials, anti-counterfeiting materials,
information storage,
humidity driving systems, detecting devices and the like.