The invention relates to the field of structures for spaceflight, in particular to an additive manufacturing metal skin lattice structure used for storage tank installation and a design method of theadditive manufacturing metal skin lattice structure. The structure comprises a skin and a space lattice structure, and the space lattice structure fills the skin. The skin and the space lattice structure form a spherical shell structure. A fixing part is arranged on the peripheral wall of the spherical shell structure and is arranged on the skin; the space lattice structure is used for bearing thestorage box. The skin is filled with the lattice structure, so that the mass of the whole bearing structure is reduced, and the overall rigidity is improved. The fixing parts are arranged around thespherical shell structure, so that the whole bearing structure does not need a pull rod supported in the normal direction, the rigidity is higher, and the bearing capacity is higher.