Using data of listed family firms and based on the multivariable regression model, this paper studies the changes in the quality of accounting information of family firms during the succession period as well as the regulating effect of successor’ characteristic variables—educational level on the relation between succession and accounting conservatism. The results show: The succession of family firms will improve the level of accounting conservatism, suggesting that after the succession, the leader’s personal authority and social capital declined, and the information disclosure level of the firm tends to be conservative; besides, the successors’ personal qualities, particularly the educational and professional background will have a significant impact on the accounting conservatism after taking over the corporate. It can be seen that as a special stage, the succession will affect the accounting information disclosure policy of family firms, and it shows strong heterogeneity with the succession.