Fixing anchor for waterproofing sheets, especially for waterproofing tunnels and the like, comprising a support plate flat resilient, preferably metal, and an external coating based on two sheets of thermoplastic material joined together at their periphery, locking the support plate, wherein both plates a central opening, facing the openings of the plates, whose deformation determined by one of the faces of the plate, a recess, and the opposite one projecting region, which crosses the sheet corresponding plastic through its central opening, it said deformation a background that has a central hole for passage of a nail or tip subject to the surface to be waterproofed.
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