Prefabricated flood prevention plate

The utility model provides a prefabricated flood prevention plate with higher flood impact resistance. A prefabricated flood prevention plate comprises a bottom plate, a water baffle and a plurality of reinforcing ribs, the bottom end of the water baffle is connected with the bottom plate, the water baffle and the bottom plate form an integrated structure with an L-shaped section, the water baffle comprises a first straight part, a second straight part and an arch-shaped part, and the arch-shaped part is located between the first straight part and the second straight part. The projection of the arch-shaped part on the bottom plate is an arc protruding towards the direction of the bottom plate, the arch-shaped part is provided with a plurality of blind holes sunken in the surface of the arch-shaped part, an elastic block is arranged in each blind hole and fixedly connected with the hole bottom wall of the corresponding blind hole, and each reinforcing rib is fixedly connected with the surface of the water baff