Audit increases the credibility and transparency of information available to users, and with the increase in the quality of the audit, the quality of financial reporting also increases. In fact, auditing reduces information uncertainty between management and users, so that users of financial reports have the ability to evaluate and predict the company's financial performance. Therefore, the purpose of this research is to determine the moderating role of the quality of financial reporting on the relationship between the double effort of independent auditors and the abnormal return of shares of companies listed on the Tehran Stock Exchange. For this purpose, the information collected from 105 companies between 1392 and 1400 has been tested using multivariate regression. In this research, three quality components of financial reporting are used, including conditional conservatism of accounting, comparability of financial statements and transparency of financial information. The findings of the research showed that the double effort of independent auditors has a negative and significant effect on the abnormal returns of the investigated companies' shares. Also, the results showed that all three components of the quality of financial reporting have strengthened the negative effect of the double efforts of independent auditors on the abnormal return of shares of companies admitted to the Tehran Stock Exchange. This result can be interpreted from the perspective of inherent audit risk and information efficiency; Because the comparability of accounting information reduces audit risk and the cost of obtaining evidence. The results of the research confirm the impact of auditing and the quality of financial reporting in reducing information asymmetry and agency costs, and considering the weak efficiency of the Iranian capital market, it is suggested that these two categories be given serious attention.