The invention discloses an additive-manufacturing-oriented lattice structure construction method based on finite element meshes. The method comprises the following steps that S1, meshing discretization is carried out on a given geometric model by utilizing a finite element meshing technology to form a mesh model; S2, a lattice unit cell model is selected; S3, each mesh in the mesh model is filledwith the selected lattice unit cell model by using mesh node information of the mesh model and mesh unit edge information of the mesh model to finish lattice structure assembly. Compared with a traditional lattice integration technology, the construction method greatly improves the adaptability to the complex geometric model in the filling process of the lattice unit cell model, and the problems of unit cell breaking, deformation and the like on a complex geometric boundary are avoided. Besides, the method has a good parameter control characteristic, can easily adjust the unit cell mode, density distribution and the like of a lattice structure driven by parameterization, and has good and wide application prospects.