In the present invention, since the fixing bracket in which the sheet fusion part is integrally coupled is seated in the mounting groove formed on the wall of the concrete reservoir and is firmly fixed by the adhesive or the fixing part, it is possible to maintain a solid fixing force while increasing workability, and the fusion surface of the sheet fusion part It relates to a lining structure using a composite antibacterial PE sheet that prevents the proliferation and expansion and shrinkage expansion of antifungal and harmful bacteria by heat-sealing the composite antibacterial PE sheet at high frequency.