The invention discloses a negative Poisson's ratio aluminum-based lattice structure and a preparation method thereof. The negative Poisson's ratio aluminum-based lattice structure is formed by periodically arranging one or more
layers of unit
cell structures, the unit
cell structures are of pull bulging type three-dimensional negative Poisson's ratio structures, the material is a negative Poisson's ratio material, the negative Poisson's ratio material is industrial pure aluminum or an aluminum
alloy, and the unit
cell structures are formed by connecting a plurality of horizontally-arranged andslantly-arranged rod units; and the
diameter of the unit cell rod units is 0.5-5.0 mm, the length of the unit cell rod units is 0.5-15.0 mm, and the included angle between the slantly-arranged rod units and the projective planes of the rod units is 30-70 degrees; and CATIA
software is adopted for modeling and design, a
polymer material and a 3D printing technology are adopted for manufacturing amodel, a porous skeleton is made by soluble
gypsum, and the aluminum-based negative Poisson's ratio lattice material is prepared by a
positive pressure gas pressure percolation technology. The 3D printing and pressure
percolation technologies are adopted to prepare the aluminum-based lattice structure in a combined manner; and the negative Poisson's ratio aluminum-based lattice structure which hasthe characteristics of
small unit cells, thin rod elements,
multiple layer levels, complex configuration and the like is achieved.