Under the background of the era of significantly accelerated urbanization process, assembled buildings have received widespread attention in the construction field, which also makes the urbanization construction mode is at a critical stage of transformation and upgrading. The emergence of assembled buildings has overcome many technical defects of traditional cast-in-place structures, not only shortening the construction period, but also improving significantly in terms of energy saving and environmental protection. Building informatization represented by BIM technology has the characteristics of synergy and intelligence, while this study will analyze the low-carbon and energy-saving design of assembled buildings based on BIM to provide people with a more comfortable and environmentally friendly building environment.