Knowledge innovation is playing an increasingly important role in promoting economic development. Industrial cluster is a major carrier of economy development. The important fields and viewpoints of foreign scholars on the study of knowledge creation in clusters are analyzed, in order to provide support for domestic economic development. Firstly, one of the externalities of clusters–knowledge spillover is introduced, mainly around local buzz and global pipelines. Secondly, the knowledge itself is analyzed, with different types of knowledge being enumerated. Then the network structure of knowledge is introduced around the transmission characteristic of knowledge. Finally, the relevant contents and viewpoints of other key areas are introduced, such as the dynamic evolution of knowledge, innovation process, and proximity dimension.