The present invention is to provide a non-power rainwater treatment system for an environmentally friendly pocket park and a rainwater treatment method capable of applying a low impact development (LID) which can store, supply, filter, and recycle rainwater to an urban green area, such as a pocket park which is open to the general public and formed in common with an open area of an adjacent land or around a focal point of major pedestrian ways, and being operated without power. To achieve the purpose, the present invention provides the non-power rainwater treatment system for a pocket park as a system to utilize the rainwater in the urban green area including the pocket park. The non-power rainwater treatment system for a pocket park comprises: a permeation unit to lead the rainwater toward the ground; a supply unit to collect and supply the rainwater permeated through the permeation unit; a filtering unit to filter the rainwater received from the supply unit; a storage unit to store the rainwater filtered in the filtering unit; and a non-power rainwater supply unit to lead the rainwater stored in the storage unit to the ground through a capillary phenomenon.
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