As there are many studies on the predictors of corporate social responsibility (CSR) reporting, the influences of foreign direct investments (FDIs) knowledge spillovers (KSs) on CSR reporting in developing countries remain unclear. This paper introduces the passive-learning KSs concept to explain whether, why, and how domestic firms learn CSR knowledge from their foreign counterparts. First, we investigate the relationship between foreign ownership and the quality of CSR reporting (CSRQ). Second, we test the moderating effect of three types of direct institutional pressures: the green development policy, the mandatory CSR reporting requirement, and CSR regulations issued by the State-owned Assets Supervision and Administration Commission. Third, we examine the moderating effect of board interlocks to explore the indirect impacts of institutional pressures. We run regressions on a sample of Chinese A-share listed companies and the hypotheses are generally supported. This paper contributes to the literature on CSR reporting and FDIs KSs by adopting the passive-learning KSs theory to explain CSR KSs in developing countries.