The invention discloses a mountainous region
sponge urban three-section rainwater collection, purification and utilization
system which comprises a rainwater
collection system, a rainwater purification
system and a rainwater utilization
system. The rainwater
collection system comprises a plurality of afforesting grooves formed from the mountaintop to the mountainside in sequence, a plurality of sand
settling ponds and a plurality of
water collection tanks; the rainwater purification system is formed by arranging a plurality of primary purification grooves and a plurality of secondary purification grooves in a ladder shape along a mountain body downwards, and the primary purification grooves are provided with an anti-scouring layer, a soil layer, a coarse sand layer and a purification layer from top to bottom in sequence; the secondary purification grooves are provided with a soil layer and a filter layer from top to bottom in sequence; the rainwater utilization system comprises an upper landscape pond and a lower
water storage tank, and a concrete partition plate is arranged between the landscape pond and the
water storage tank. The mountain body environment can be afforested and beautified, the good landscape effect is achieved, pollutants in rainwater can be absorbed so as to purify water, and the system is particularly suitable for building a mountainous region
sponge city with water resource shortage.