With the continuous development and popularization of big data technology，smart water construction has become an inevitable trend in the future development of the water sector. This article conducts a review and analysis of the construction practices and applications of big data in smart water services，provides an in-depth introduction to the development trends and challenges of smart water services，proposes an overall smart water service architecture that is in line with the actual business practices of water supply companies，and studies the application of big data technology in water supply “water networking”，production operation system，service marketing system and comprehensive management system construction. This article takes the digital transformation practice of Hefei Water Supply Group Co.，Ltd as an example，proposes a complete digital transformation solution for water supply enterprises，and evaluates the construction effect.