The invention relates to a phase-change energy storage device lattice interlayer structure based on additive manufacturing, and belongs to the technical field of spacecraft lightweight multifunctionalstructures. The interlayer structure is an integrated structure prepared through an additive manufacturing technology, a shell is arranged on the exterior, the interior is designed to be a three-dimensional network structure, lightweight design of a phase-change energy storage device is achieved, and the weight is decreased by 60% or above compared with a traditional structure; and the three-dimensional network structure is formed through translation of two repetitive units including a sparse lattice cell unit with a specific structure and a compact lattice cell unit with a specific structurein the space, and therefore the condition that the top of the phase-change energy storage device generates structural collapse can be avoided. According to the phase-change energy storage device lattice interlayer structure based on additive manufacturing, integrated forming is conducted through the additive manufacturing technology, the strength problem caused by welding does not exist, and thestructure has the excellent mechanical property; in addition, the preparation technology has the advantages of being high in manufacturing precision and short in period, the manufacturing efficiency is greatly improved, and the structure has a good application prospect on the phase-change energy storage device structure design aspect in the fields of spaceflight, aviation, energy sources, preciseinstruments and the like.