A modularization-based processing system for road rainwater runoff in a low impact city, the system comprising modularized curbs and a processing pool. The modularized curbs form side walls of the processing pool. The modularized curbs comprise modules A (1), modules B (2), and modules C (3). The modules C (3) are provided with an opening at an upper portion thereof. The processing pool comprises a first-stage processing pool (4), a second-stage processing pool (5), and a third-stage processing pool (6). A module C (3) is provided between the first-stage processing pool and the second-stage processing pool, and between the second-stage processing pool and the third-stage processing pool. A rainwater inlet is provided at the first-stage processing pool (4). A gravel layer (41) is provided at the rainwater inlet. Also disclosed is a modularization-based processing method for road rainwater runoff in a low impact city.
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