Mobile barrier for high water protection

System for protection against high waters is constructed from assembled protective walls, fixed on the ground/dam and interconnected between them selves, each to another. Each protective wall 1 contains, in its body, a first edge 1.1 and second edge 1.2, that are positioned under right angles, lying from the both sides of the guiding plates 2. The guiding plates 2 stands forward, over the body, with the edge 1.1, whereby it forms first gap S1 in the U-shape in the form of slot, and two other guiding plates 2, formed the second edge 1.2 that creates second gap S2 in the form of slot. The third edge 1.3 is extended from the upper side, while the fourth edge 1.4 is parallel with the second edge 1.2 while in the gap S2, between guiding plates 2, the protective wall is attached as a slider. The guiding plates 2 are arranged on the first edge 1.1, appropriately distanced from the fourth edge 1.4, by means of that, the inserting of the protective walls each to another over the stilt for forming the series, is provided. The fixing element 3 sits in the middle of the fixing part 4, whereby it built main plate in T-shape. The protective walls 1 are in clutch with assembled fixing element 3 in the area of the gap S1. The fixing part 4 is fixed by means of not shown connecting elements on the ground B, on the dam or on the fundament. By this invention is created one secure, complete, flexible and, in the case of need, fast and simple assembling structure for protection against high waters.