A boat hull structure includes an inner layer formed of multiple inner plates each having two mounting flanges at two sides, an outer layer formed of multiple outer plates each having two mounting flanges at two sides, multiple spacer plates connected between the mounting flanges of each two adjacent inner plates and the mounting flanges of each two adjacent outer plates to keep the inner layer and the outer layer in parallel and to define a plurality of independent air chambers between the inner layer and the outer layer, and fastening members affixing the spacer plates to the outer plates and the inner plates.

 
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