As a representative product of Internet information technology, the emergence of social media has an important impact on the economic behavior of market participants. From the perspective of corporate auditor selection, this paper studies how corporate microblog information disclosure affects the decision making behavior of management through influencing market participants. It is found that companies with more microblog information disclosure are more inclined to choose high-quality auditors, and the disclosure of microblog information mainly prompts management to choose high-quality auditors through two channels: external attention pressure and internal supervision pressure. Heterogeneity analysis found that for companies with higher investor information demand, higher internal control level and more intense market competition, the impact of microblog information disclosure on auditor selection was more obvious. This research helps investors and regulators to better understand the mechanism of social media information, and has certain implications for further improving the information disclosure system to promote the healthy development of the capital market.