The terminologies in the title and abstract of scientific publications can reflect the research hotspots in POM-based photocatalysis. The terminologies with more than five occurrences in 1382 documents were identified and extracted by the terminologies recognition algorithm of VOSviewer software. To clearly visualise the results, it was necessary to filter and merge the list of terminologies obtained in the following way. Firstly, terminologies such as "polyoxometalate" and "photocatalysis" were excluded, as well as terminologies of low research value such as "research" and "article". Secondly, some synonyms are merged, such as "crystal-structure" and "crystalstructure". Finally, we obtained a co-occurrence network constructed from 227 terminologies. Clusters in Figure represent terminologies for two different topics, represented by clusters #1 (purple) and #2 (green). In addition, Table provides the terminologies with a higher ranking in each cluster. According to terminologies similarity and co-occurrence, 227 nodes are divided into nearly symmetric clusters. The high-frequency terms of the two clusters are analyzed. Cluster #1 is summarized as "Synthesis and structure of POM-based photocatalyst", and the other is "Application and performance of POM-based photocatalyst".