Flood prevention device

The invention relates to the technical field of flood prevention facilities, and aims to provide a flood prevention device, all parts of the flood prevention device do not need to be manually installed on site, and time and labor are saved during arrangement. The flood prevention device comprises a lower blocking piece, an upper blocking piece and two water blocking pieces. The lower stopper is arranged on the ground; one end of the upper blocking piece is connected with one end of the lower blocking piece, and the other end of the upper blocking piece and the other end of the lower blocking piece face the flood coming direction. The two water retaining pieces are arranged on the two sides of the upper retaining piece and the lower retaining piece, the orientation of the water retaining pieces is perpendicular to the coming direction of flood, one ends of the water retaining pieces are connected with the bottom face of the upper retaining piece, and the other ends of the water retaining pieces are connected w