Abstract: Studying the impact of new-type urbanization on urban land green use efficiency is of great significance for achieving high-quality development of urbanization and sustainable use of urban land. Using 41 cities in the Yangtze River Delta region from 2005 to 2020, the impact of new-type urbanization on urban land green use efficiency and spatial effect were analyzed using methods of super efficiency SBM model, window analysis method, and spatial panel Durbin model. The results showed that: (1) the level of new-type urbanization showed a fluctuating trend, and urban land green use efficiency showed a fluctuating trend. From a regional perspective, the characteristics in the order of Shanghai > Zhejiang > Jiangsu > Anhui were presented. The spatial difference between new-type urbanization and urban land green use efficiency was obvious. (2) There was a significant spatial positive correlation between the level of new-type urbanization and urban land green use efficiency. The change trend of bivariate global Moran's I presented an obvious “M” type, and the overall spatial dependence of the two was obvious. The local spatial correlation types between new-type urbanization and urban land green use efficiency had been increasing, after 2010, with high concentration areas mainly distributed in southern Jiangsu and northern Zhejiang, and low concentration areas in northern Jiangsu and northern Anhui. (3) New-type urbanization can significantly improve urban land green use efficiency, showing a positive spatial spillover effect. Population density, foreign trade level, science and technology level, industrial structure and government scale all have different degrees of impacts.