River flood prevention protection device

The utility model discloses a river flood prevention protection device which comprises a revetment, a water blocking groove is formed in the top end of the revetment, a water blocking plate is arranged in the water blocking groove, the bottom end of the water blocking plate is fixedly connected with a floating plate, and the side end of the floating plate is fixedly connected with a floating extension plate. Water flows into the water blocking groove from the penetrating groove, at the moment, the water can abut against the floating plate and the floating extension plate to rise, the water level rises ceaselessly, meanwhile, the water blocking plate rises ceaselessly, the water can be blocked at the side ends of the water blocking plate and the water blocking groove all the time, flood can be blocked through cooperation of the water blocking plate and the water blocking groove, and the flood prevention effect is improved; when the water level drops to the bottom end of the revetment, water in the water retain