The invention discloses a spent fuel storage grillwork for a nuclear power plant. The spent fuel storage grillwork comprises a peripheral plate, a wide plate, a narrow plate, a base plate and a support leg assembly. The peripheral plate, the wide plate and the narrow plate are spliced to form a lattice structure in an embedded way; the bottoms of the peripheral plate, the wide plate and the narrow plate are respectively and fixedly arranged on the base plate; the support leg assembly is fixedly arranged on the base plate and is used for supporting the base plate; and neutron absorbers are respectively and fixedly arranged on the wide plate and the narrow plate. Compared with the prior art, a main body of the spent fuel storage grillwork is of an embedded splicing structure, so that the size of the lattices can be relatively intensive and stable and the intensity and the safety of the fuel assembly storage are improved. Due to the adoption of modular assembly, the processing difficulty can be greatly reduced and the quality of the spent fuel storage grillwork for the nuclear power plant is improved.