Recent years, with the massive consumption of lithium and the strong increase in the price of lithium, the application of lithium battery is limited in some extent.?With the similar working principle and battery components, sodium-ion batteries have exhibited a great opportunity for development and attracted extensive attention of many researchers.?Polyanionic compounds have the advantages of high and stable voltage platform, diverse structure, stable structure and fast diffusion rate of sodium-ions, which have become the research hotspot of cathode materials for sodium batteries. However, their large anionic groups lead to poor electron rate, which limits the specific capacity and rate capability of the materials.?In this review, the research status of various polyanionic cathode materials is mentioned, which have discussed the relationship between crystal structure and electrochemical properties of the materials, some modification strategies including element doping and substitution, carbon coating and carbon recombination, and nanostructure design.