We examine the effect of the identification of high-tech enterprises on corporate innovation from the perspective of supplier relationship management. We use data from the Shanghai and Shenzhen A-share listed companies in China from 2007 to 2020 as samples and a time-varying difference-in-differences (DID) method. The results show that the identification of high-tech enterprises significantly promotes corporate innovation. The potential mechanism is that there is a sharp decline in the concentration of suppliers, the occupation of suppliers’ trade credit, and the inventory cost of enterprise after getting the identification of high-tech enterprises. Further analyses show that the enterprise identified as a high-tech enterprise tends to be more innovative due to the improvement of the supplier relationship management, leading to a better operating performance. Overall, our findings indicates a positive implementation effect of the policy of identification of high-tech enterprises. This paper not only contributes to the research about the economic consequences of the identification of high-tech enterprises from the perspective of supplier relationship management, but also enriches the existing literature on the effect of the supply relationship on corporate innovation, and supplier relationship management from the perspective of identification of high-tech enterprises. In summary, this study provides a theoretical basis and policy reference for the evaluation of the implementation effect of the policy of identification of high-tech enterprises, and the strengthening of supplier relationship management .