Disclosed is a network water army group identifying method and system. The method comprises obtaining irritable response data of multiple network groups; according to the irritable response data, marking out suspicious network water army group samples; according to the suspicious network water army group samples and existing network water arm group samples, determining the irritable response characteristics of network water army groups; according to the irritable response characteristics of the network water army groups, establishing network water army group active identification models; identifying the network water army groups inside the multiple network groups through the network water army group active identification models. The network water army group identifying method and system solves the technical problem that traditional network water army identifying method cannot identify network water armies before the network water armies cause harm, achieves active identification on the network water armies and avoids the harm caused by the network water armies. Besides, by categorizing network users with identical or similar behavioral characteristics into one network group, the network water arm identification accuracy can be enhanced.