With new technologies emerging, productivity is increasing, while environmental issues are being addressed. Studies focus on the benefits of technological progress but pay limited attention to potential risks. This paper uses data from 286 Chinese cities to explore the impact of industrial robots on urban green total factor productivity. We find that industrial robots significantly reduces urban green total factor productivity. Mechanism analysis shows the main effect is driven by manufacturing agglomeration and crowding out environmental investment. Urban green total factor productivity decomposition shows that industrial robots block green technical progress and efficiency. Heterogeneity analysis shows that industrial robots significantly impact urban green total factor productivity in developed, highly market-oriented, and industrialized regions. Our findings contribute to a deeper understanding of the role of industrial robots in urban green development and provide corresponding policy implications for guiding the harmonious development of technology and sustainable urban growth.