Buoyant geomembrane device for preventing overtopping and dam break

The invention discloses a buoyant geomembrane device for preventing overtopping and dam break. A wave wall is arranged on a crest of one side of the upstream side, rectangular grooves are fixedly formed in the side wall of the upstream face of the wave wall, the length direction of the rectangular grooves is parallel to the height direction of the wave wall, a plurality of water inlets are formedin the side walls close to the top ends of the rectangular grooves, floating balls are arranged in the rectangular groove, the lower end of each floating ball is connected with one end of an anti-corrosion metal wire, the bottom of each rectangular groove is fixedly connected with one end of a PVC pipe, the other end of each PVC pipe is located in the crest and penetrates through the crest and extends out of the side wall of the downstream face of the crest, the other end of each anti-corrosion metal wire penetrates through the corresponding PVC pipe and extends out of the side wall of the downstream face of the crest