The development of the digital economy has shown outstanding advantages for the technological progress of enterprises. This article explores the impact of big data policies on the quality of technological innovation from the perspective of policy evaluation. Using data from listed companies from 2007 to 2020，it empirically tests the impact of big data policies on the quality of technological innovation. Research has shown that the implementation of big data policies does have a significant promoting effect on the quality of technological innovation. The implementation of big data policies not only increases enterprise research and development investment，but also significantly reduces enterprise financing constraints，and also increases the returns of enterprise technological innovation，ultimately beneficial for improving the quality of technological innovation. Whether in different state-owned or non-state-owned enterprises，the implementation of big data policies can significantly promote the quality of technological innovation. Compared with state-owned enterprises，the implementation of big data policies in non-state-owned enterprises has a stronger promotion intensity on the quality of technological innovation；Whether it is high R&D investment enterprises or low R&D investment enterprises，the implementation of big data policies has a promoting effect on the quality of enterprise technological innovation，and among high R&D investment enterprises，the implementation of big data policies has a stronger promoting effect on the quality of enterprise technological innovation；Compared to high profit enterprises，the implementation of big data policies can significantly improve the quality of technological innovation in low profit enterprises.