Based on the crawler data of the Q&A section of the online interactive platforms of Shenzhen Stock Exchange “Interaction Easy” and Shanghai Stock Exchange “E interaction”, taking the listed companies in Shanghai and Shenzhen stock exchanges from 2013 to 2018 as samples, this paper systematically studies the impact of information interaction between listed companies and investors on audit fees. The results show that: the higher the number of investors’ questions, the number of companies’ answers and the companies’ response rate, the shorter the Q&A interval, the higher the degree of information disclosure and the lower the degree of information asymmetry, which makes audit risks and audit fees decline. The conclusion can provide empirical evidence for the relationship between information interaction and audit fees, and promote the research of network interaction platform information in the field of audit.