The present invention relates to a rainwater recycling city dam, and more particularly, it stores rainwater flowing in the sidewalk during rain, and discharges the stored rainwater when the dry season or the external fine dust concentration is high or the external temperature is high to reduce fine dust and ground temperature, and supply stored rainwater to green areas provided on the side of the road to use for green vegetation, thereby enabling recycling and recycling of resources and reducing the cost of reducing fine dust and external temperature. To this end, the present invention relates to a rainwater storage tank that is disposed underground in India and stores rainwater flowing in from India during rain, and is detachably coupled to the upper end of the rainwater storage tank. Stormwater storage module with cover; a rainwater discharge module for discharging rainwater stored in the rainwater storage tank of the rainwater storage module to a green area formed on the outside of a road or sidewalk through which vehicles pass; Including; a control module for controlling the operation of the rainwater discharge module, the rainwater storage tank is formed by a bottom plate, a plurality of side plates disposed upward from the edge of the bottom plate, and the bottom plate and the side plate, A storage space in which the introduced rainwater is stored, a connection hole formed through the lower end of the side plate to communicate the inside and the outside, and a pipe body extending in the longitudinal direction connected to the connection hole of a pair of adjacent stormwater storage tanks and a stopper detachably coupled to the connection hole.
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