[Purpose/significance] In order to provide inspiration and reference for researchers and platform operators,this paper systematically sorts out the knowledge base,research system and prospects of social knowledge behavior research in social networks.[Method/process] Applying CNKI and Web of Science as the data source,this article screens 87 representative documents of social knowledge behavior in social network of users.This study combs the knowledge base of research from five aspects:research topic,research method,research theory,application scenario and factors through systematic review.Then this paper establish the research system of the user’s social knowledge behavior based on the S-O-R model,and the exploratory analysis of the prospects is carried out.[Result/conclusion] In the future,there are still large exploration spaces in the application scenarios,research theories,research objects,research methods,concept types and research factors.The cross-integration of multidisciplinary research theories and the research methods will lead to a rich research topic.