The invention provides an additively manufactured spent fuel storage grillage which comprises a base plate, a storage chamber, a neutron absorbing plate, a shell and a hoarding plate in turn from bottom to top. An additive manufacturing method is adopted for printing layer by layer from bottom to top so as to integrally form the grillage. Compared with the traditional welded or assembled type spent fuel storage grillage, the additively manufactured spent fuel storage grillage has the characteristics of simple structure form, high structure strength, simple manufacturing technique, short manufacturing period, and the like; the problems of large welding volume, difficulty in controlling welding deformation, complex manufacturing assembly, and the like, of the traditional spent fuel storage grillage can be avoided; the distance between the storage chambers can be reduced; the dense storage can be realized; and the storage volume of a spent fuel pool can be increased.