The invention discloses a hollowed-out lattice sandwich layer with gradient functionality. The hollowed-out lattice sandwich layer with gradient functionality comprises two cladding plates, wherein a core sandwich layer is arranged between the cladding plates and comprises a plurality of hollowed-out lattice filling units which are connected with one another; and each hollowed-out lattice filling unit consists of a plurality of tiny dense hollowed-out base cells. The hollowed-out sandwich layer is formed by the hollowed-out lattice filling units, and is light in structure weight and high in specific strength, the maximum weight reduction benefit can reach 85% or above, and meanwhile, the hollowed-out lattice sandwich layer has functional benefits such as heat insulation and sound insulation; comprehensive benefits of structure light weight and functionalization are improved, property mismatching of a sandwich board with the single structure in the application field under various working conditions is avoided, and finally, the gradient function is fulfilled; and meanwhile, a selective laser melting technology is adopted, the risk of reduction of strength of a connecting region between a traditional sandwich layer and an outer cladding plate and complicated multi-process flow can be avoided, and therefore, the use value is quite high.