Based on the National Audit Reports， this paper takes state-owned listed companies as a sample， and studies the effect of national audit on corporate innovation investment and finds： firstly， national audit can promote corporate innovation investment of central-owned companies， and the more serious the violations revealed by the national audit announcements are， the stronger the promotion of corporate innovation investment by national audit is， especially in the central-owned companies with higher management implicit corruption; secondly， compared to the single national audit， repeating audit has no a significant difference in promoting the innovation input; finally， there is an industry contagion effect of national audit on the corporate innovation investment.