The present invention is self relates to high-density polyethylene resin sheet with a leak-proof feature to prevent and restore the reduction in the degree and waterproof effect, which may be caused damage after been constructed as chasumak or waterproofing membrane, self-of the present invention leakage protection is a high-density polyethylene resin sheet is high density polyethylene sheet layer by applying and evenly to the water absorbent resin more than 0.01g / ㎠ on a high density polyethylene sheet and sealed by pressing and heating the covered high density polyethylene sheet thereon, a resin layer and high density polyethylene which consists of the structure of the sheet layer, is damaged after the construction by chasumak mechanical or part of the film by physical and chemical damage to the temporarily-order, and moisture effect is reduced even if the damaged rapidly by the high absorbent resin filled in the chasumak recovery By continuously the original waterproof It may be maintained in the long term, and in addition by ion exchange properties of the water absorbent resin has a feature to remove contaminants such as heavy metals contained in the water.
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