The invention relates to an expressway rainwater collection and utilization system and belongs to the technical field of expressway rainwater and flood resource utilization. The expressway rainwater collection and utilization system mainly comprises a water storing unit and a water spraying unit which are communicated through a pipe. The water storing unit is provided with a water filtering module and a water storing module. The water filtering module comprise a high scarp, water passing culverts are formed in two sides of the high scarp, emerged plants are arranged in the water passing culverts, the outer side of the high scarp and the outer sides of the water passing culverts are provided with water flow channels, and the other end of each water flow channel is communicated with the water storing module. The expressway rainwater collection and utilization system can achieve front gravel and particle filtration by designing a brand-new structure and ensures that rainwater entering an impounding reservoir has very high purity from a source.