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Based on the unique perspective of local environmental regulations promulgated in Chinese prefecture-level cities from 2000 to 2018, this paper examines the impact of urban environmental legislation on green total factor energy efficiency (GTFEE). The results show that implementing environmental legislation significantly improves local GTFEE , with comprehensive protection regulations contributing to local energy efficiency improvements, while the impact of pollution prevention regulations is insignificant. This conclusion remains robust to multiple scenarios. Potential mechanisms through which environmental legislation can guide urban green transition include the industrial upgrading effect represented by "clean industry development" and "polluting industry exit", as well as the technical innovation effect achieved through "new technology generation" and "old technology upgrading". Furthermore, environmental legislation with a higher degree of regulatory effectiveness has a greater potential for energy saving. Environmental legislation has a more significant impact on improving GTFEE in cities in non-old industrial bases, with less frequent turnover of officials, and in central and western regions in China. This study evaluates the positive impact of urban environmental legislation on GTFEE , aiming to advancing the rule of law in local environmental pollution governance and thereby promote urban green transition. • Use a Difference-in-Differences model to explore the effect of urban environmental legislation. • Environmental legislation guides urban green transition development. • The impact of heterogeneous urban environmental regulations on green transition development. • Industrial upgrading and Technical innovation have positive mediating roles. • Environmental legislation policy has city attributes, official turnover and location heterogeneity. [ABSTRACT FROM AUTHOR]