<p>Sodium salt waste (SSW) mainly contains sodium salts and ⁹⁰Sr/¹³⁷Cs, with a complex composition. This review presents the advantages and disadvantages of typical immobilization materials, focuses on analyzing the advantages of geopolymers in immobilizing SSW, and addresses the problems that need to be solved in the future, such as the solidification efficiency caused by the change of SSW compositions and the decline in the durability of the geopolymer waste–forms due to salt residues. The article also proposes coping strategies, including optimizing the solidification method through a multi–phase coexisting structure and improving the material durability through sintering technology.</p>