PURPOSE: A variable prefabricated device for preventing an offensive odor is provided to variously curve a drainage guide plate and a support plate depending on the size and shape of a street inlet. CONSTITUTION: A variable prefabricated device for preventing an offensive odor is composed of a pair of side plates(10), a drainage guide plate and a support plate. The side plates form side walls. The drainage guide plate connects the side plates and guides flowing rainwater and sewage. The support plate connects the side plates nad form a drainage space(38) for rainwater and sewage. Opening and closing plates(35) are rotatably formed in the bottom of the drainage space.
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