An external building wall pipe network ecological greening system for secondary water reuse in a sponge city, comprising: a rooftop (1), a rainwater collection box (2), water drainage pipes (3), wash basins (4), filters (5), solar panels (6), a computer/mobile phone smart automatic/manual control organic nutrient solution, particle fertilizer/water quality improvement chemical additive and particle/drop box cloud application interaction system (7-1-2), plant growth covers (8), three-chamber pipe-linked pipe-type water circulating plant growth pipe disks (10), optimally cultivated terrestrial and aquatic plants suitable for growing in secondary city water; water channels surrounding the city/water channels surrounding buildings as well as the optimally cultivated terrestrial and aquatic plants suitable for growing in secondary city water, and excess water being discharged to an underground city pipe network after the secondary water is purified by means of plant growth are effective approaches to and provide strong support for the construction of a sponge city.
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