PURPOSE: A siphon type rainwater storage device is provided to automatically exhaust rainwater stored in a storage device by arranging a double water drain pipe inside the storage device. CONSTITUTION: A siphon type rainwater storage device comprises a body part(10), a first weight(20), a double water drain pipe, and a support(50). The body part accepts rainwater. The first weight has a moisture absorber(21), a housing(22), and a porous cover(23). The moisture absorber absorbs the rainwater. The housing accepts the moisture absorber. The porous cover is coupled to the opened top of the housing. The double water drain pipe has an inlet pipe and an outlet pipe. The support has a connection member which connects the first weight and the top of the double water drain pipe.
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