The present invention relates to a method of preparing a reclaimed land within a seawall and a facility structure using the same. The facility structure includes temporary soil portions 20 installed by piling up soil or stone material along the circumference of a planned reclaimed land 10 and configured to prevent inland waters from being introduced into the planned reclaimed land 10 of the seawall 1; an excavation portion 50 configured to have a ground depression formed therein by dredging a specific area within the planned reclaimed land 10; banking portions 30 configured to form flatlands higher than an inland altitude by reclaiming the planned reclaimed land 10 other than the excavation portion 50 by using earth and sand obtained from the excavation portion 50; and a cut-off portion 40 installed along a circumference of the excavation portion 50.
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