"synthesis and structure of POM-based photocatalysts" and "application performance of POM-based photocatalysts". At the same time, POM-based MOFs, dye degradation and HER are the research hotspots. POM-based MOFs have recently shown great promise in energy conversion and storage, catalysis and magnetism due to the advantages of both POMs and MOFs. POMs with stable structures interact with MOFs through electrostatic interaction, coordination bond and hydrogen bond, enhancing POM-based MOFs' stability. In addition, POMs are highly dispersed in the pores of MOFs, ensuring the high-density arrangement of active sites. Therefore, the crystalline POM-based MOFs exhibit efficient performance in heterogeneous photocatalytic reactions. However, some problems need to be solved to effectively regulate the structure and properties of POM-based MOFs. Most POM-based MOFs synthesis information will be covered by the "one-pot" method. The pH value, reaction time and temperature, the type and proportion of reactants in the reaction system increase the uncontrollability of POM-based MOFs. In addition, POMs precursors are mostly concentrated in the basic structural types such as Kiggen and Anderson, and other types of structures need further study. From the perspective of photocatalytic type, POMbased MOFs are mainly used for dye degradation and hydrogen