Abstract
This paper first analyzes the current status of sponge city construction at home and abroad, and combines the actual construction of sponge cities at home and abroad to study and explore its problems in engineering construction. Based on the principle of sustainable development, using TRIZ theory and related engineering theories to further explore the high-efficiency collection of rainwater and high-efficiency comprehensive utilization, and combine the concept of smart city with the practice of sponge city construction to create a new type of sponge city rainwater recycling process system. This method and means of exploring and solving problems is the only way to further develop the construction of sponge cities, and it is also the general law of social development to provide exploratory reference for the construction and development of the sponge city.