Background: The spread and growth of divorce is in critical level in the country and health of family, as the cornerstone of future health of society, is exposed to problems. Objectives: This study tries to investigate the role of relationship beliefs and cognitive insight in quality of marital relationship of divorced women. Methods: This is a descriptive-correlational study and the participants chosen based on convenience sampling included 80 divorced women who referred to the Social Emergency Center of the Welfare Organization of Zanjan in the final nine months of 2017. The instruments were the Golombok Rust Inventory of Marital State (GRIMS), the Relationship Belief Inventory (RBI) of Epstein and Eidelson and the Beck Cognitive Insight Scale (BCIS). To analyze the data, the Pearson correlation coefficient and regression analysis were used. Results: Results indicated negative and significant relation between relationship beliefs and cognitive insight and the quality of marital relationship of divorced women. The results of regression analysis also indicated that the components of relationship beliefs and cognitive insight both define 51% of the variance of the quality of marital relationship. Conclusion: Results of this research showed importance of taking preventive and medication measures within framework of the educational and counseling programs with respect to the cognitive variables, especially relationship beliefs and cognitive insight.