Digital development has become increasingly important in mitigating the pressure on carbon emissions. This paper uses the data of 30 provinces in China from 2010 to 2019, introduces the intermediary effect model, builds a theoretical framework for the technological innovation, carbon, digital economy, and empirically tests the mechanism of the three. The research finds that: (1) Digital economy and technological innovation have a strong positive impact on the improvement of carbon productivity, and the impact of digital economy is significantly higher than that of technological innovation. (2) As an intermediary variable, innovation is the core transmission channel for digital economy to develop China's carbon productivity, effectively transmitting the impact of digital economy development to carbon productivity. (3) The impact of digital economy on carbon productivity in different regions is different. The most obvious impact is in the east.