To control their greenhouse gas emissions, China has recently been instituting the low-carbon city pilot (LCCP) policy in target areas. Studies examining those environmental regulations have not focused on how they affect enterprise competitiveness, especially emphasizing the LCCP's dynamic effect. Here, we use the quasi-experimental opportunities of the LCCP policy along with a staggered difference-in-difference model to evaluate and explain the in uences and transmission mechanisms of the LCCP policy on enterprise competitiveness. The empirical results show that (1) the construction of low-carbon cities signi cantly reduces, by 3.56%, the average enterprise competitiveness. Also, capital-intensive rms and small rms are more susceptible to adverse effects from the LCCP policy, but those effects weaken with time. (2) The LCCP policy affects enterprise competitiveness by increasing operating costs and reducing R&D. (3) However, those adverse effects can be suppressed when a region's degree of marketization is high and industry competition is erce. Although, our results show that the LCCP policy indeed brings greater economic costs, through market-based reforms and improved market competition, those economic distortions can weaken.