Intellectual property financial services play a dual role in expanding innovation financing channels and providing risk protection. Using the lists of patent insurance pilot cities issued by the National Intellectual Property Administration in 2012 and 2016 as a quasi-natural experiment, this study focuses on A-share listed enterprises characterized as “Specialized, Refinement, Differential, and Innovative”(SRDI) from 2007 to 2023 and constructs a multi-period difference-in-differences model to examine how patent insurance policies influence auditors’ pricing strategies. The findings reveal that the patent insurance pilot policy significantly alleviates auditors’ concerns regarding the technological risks of the SRDI enterprises through a triple mechanism of “fiscal policy assurance-litigation risk mitigation-patent quality signaling”, thereby reducing audit fees. This effect is more pronounced among privately owned enterprises with higher financing constraints and in cases where the auditing firm holds a higher status or the auditor possesses industry expertise. Moreover, the effect holds only within the sample of national-level SRDI enterprises. This study structure not only expands the research on the micro-level governance effects of patent insurance from the perspective of audit risk, but also provides empirical evidence for improving the patent insurance system and supporting the development of the SRDI enterprises.