Based on the perspective of green technology innovation and resource allocation of green finance, this paper first divides green finance into three dimensions: green credit, green securities and green insurance, then uses the panel data of 30 provinces in China from 2013 to 2020, uses the dynamic GMM panel model to analyze the nonlinear impact of green finance on high-quality economic development, discusses the mechanism of green finance promoting high-quality economic development through green technology innovation, and analyzes the moderating effect of green finance on the relationship between green technology innovation and high-quality economic development. The results show that: (1) green credit, green securities and high-quality economic development all show an inverted U-shaped relationship of "first increase and then decline", at present, the level of green credit and green securities in most central and western provinces has not crossed the inflection point, its influence to economic high quality development is in promotion stage, and green insurance has a significant linear role in promoting high-quality economic development; (2) green technology innovation plays a partial mediating role between different dimensions of green finance and high-quality economic development, and green technology innovation has the strongest transmission role in green securities promoting high-quality economic development, followed by green credit, and green insurance is the weakest; (3) green credit, green securities and green insurance all play a significant positive moderating role in the relationship between green technology innovation and high-quality economic development, and the moderating effects of the three types of green finance decrease in turn.