Promoting the development of low-carbon economy (LCEco) to protect the environment is an important dimension to enhance national competitiveness and an effective path to achieve high-quality national development. Therefore, based on the endogenous LCEco growth theory, from the two dimensions of financial technology innovation (FTI) and financial product innovation (FPI), using the spatial measurement method of SLM and SEM, using the panel data of 30 provinces (municipalities and autonomous regions) from 2009 to 2021, this paper deeply explores the impact of FTI and FPI on the development of LCEco. The results show that: FTI and FPI have synergistic effect and positive spatial spillover effect on the LCEco, whose elastic coefficients for them are respectively (–0.125, p < 0.05; –0.084, p < 0.05). Different regions have obvious heterogeneous effects on the FTI, FPI and LCEco, whose elastic coefficients for them are (0.318, p < 0.05; 0.332, p < 0.05). The conclusion not only provides empirical support for the endogenous LCEco growth theory, but also provides effective evidence for the high-quality development path of China’s LCEco.