Based on the panel data of 30 provinces (cities and districts) in China from 2003 to 2019, this paper uses the Green Development Index System jointly formulated and released by the National Development and Reform Commission, the National Bureau of Statistics, the Ministry of Environmental Protection and the Central Organization Department to construct a comprehensive index system which can calculate the high-quality development index of green economy, and research the impact of green credit, environmental pollution and high-quality development of green economy. The results show that: (1) The improvement of green credit is conducive to promoting the high-quality development of green economy. Considering the high autocorrelation of the high-quality development of green economy, the impact of green credit on the high-quality development of green economy is still robust and does not depend on the specific metrology. (2) With Moran Index, it is found that the high-quality development of green economy has spatial characteristics. By using Spatial Dobbin Model (SDM), it is found that under both (0,1) weight matrix and geographical distance weight matrix, the impact of green credit on the high-quality development of green economy is positive, forming a positive spatial spillover effect on the high-quality development of green economy in surrounding areas. (3) By using the Intermediary Effect Model,it can be seen that environmental pollution plays a partial intermediary effect between green credit and high-quality development of green economy. There is a transmission channel of "green credit → environmental pollution → high-quality development of green economy". (4) By using Panel Quantile Regression Model, it is found, with the improvement of high-quality development of green economy, that the promotional effect brought by green credit increased.