In recent years, with the iterative update of artificial intelligence technology, reinforcement learning has also been rapidly developed and gradually applied in many fields. At present, there are relatively few literatures describing the development trend of reinforcement learning in the field of network security. Therefore, we use knowledge graph to visually analyze 611 related articles downloaded from the Web of Science (WoS), including literature volume analysis, co-citation analysis and keyword co-occurrence analysis. Finally, the development prospects, important achievements and research hotspots of reinforcement learning in the field of network security are analyzed.