In order to realize the goals of resolving the urban road water-logging problem and collecting and utilizing rain flood resources, combined with the existing standards of rain drainage pipeline laying,different from the formerly rainwater collection system with single constructions, based on the hydraulic theoretical foundation, the device ,which combines the function of desilting, filtration and impoundment in one and takes advantage of detail designs like automatic control, water-permeable brick and vertical type water inlet, has been developed. The results showed that installing the device at the original total rain drainage pipeline can filter and drain the sediment of the drainage pipe automatically, alleviating the problem of water-logging in urban roads during the rain-flood period and utilizing rainfall flood resource for spay irrigation during drought. The new automatic wash type rainfall flood resource utilization device responds the present sponge city construction fervour with innovative thought.