Abstract: Based on the theoretical research on the mechanism of Internet promoting the innovation efficiency of high-tech industries, the nonlinear relationship between Internet development and the innovation efficiency of high-tech industries was empirically analyzed by using threshold regression model based on the panel data of China's provincial level from 2006 to 2016. The results show that Internet development has a positive nonlinear effect on the innovation efficiency of high-tech industries. The spillover effect of Internet on innovation in high-tech industries has a significant environmental constraint mechanism. With the improvement of financial development level, it presents an inverted U-shaped dynamic feature. However, with the improvement of the degree of opening to the outside world, the promotion effect of Internet on innovation efficiency of high-tech industries will be weakened. To strengthen Internet construction and promote high-quality development of the Internet, we will extensively and deeply promote the integration, innovation and development of the Internet and high-tech industries. We will promote financial development in an orderly manner and improve the opening-up policy.