A simulated MESOCOSM for testing the natural recovery ability of an oil contaminated sediment according to the present invention comprises: a testing water tank containing a marine sediment; and a pipeline structure for introducing a predetermined amount of seawater into the testing water tank at a predetermined time point, wherein the testing water tank has a supplying water tank located at an upper side thereof and a recovery water tank located at a lower side thereof so that the seawater moves by gravity. Accordingly, the present invention can solve the disadvantage of the conventional MESOCOSM which is implemented outdoors. Especially, the simulated MESOCOSM requires ultimately reduced manpower and cost and can be thus maintained even at low research expense.
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