Based on the panel data of China’s joint-stock banks, urban commercial banks and rural commercial banks from 2005 to 2017, this paper uses the difference-in-difference model to empirically examines the impact of corporate social responsibility on the commercial value of banks. The research results show that, in the short term, commercial banks have less influence on commercial value by taking social responsibility, but in the long term, social responsibility has a positive impact on the commercial value of banks. The impact of social responsibility on commercial value of banks is obviously heterogeneous.The commercial banks with higher political rank assume social responsibility and have greater impact on their commercial value.Compared with listed banks,the social responsibility of non-listed banks has a greater impact on their commercial value.In addition, compared with urban commercial banks, rural commercial banks take social responsibility and have a greater impact on their commercial value.The conclusion of this research can be used for reference to encourage commercial banks to undertake social responsibility and enhance their commercial value.