The invention discloses a double-layer net bed for repairing water by planting submerged plants. The double-layer net bed comprises an upper net sheet and a lower net sheet, wherein the upper net sheet is a quadrilateral net sheet with square meshes, and the side length of the square is 1 -5cm; the lower net sheet is a quadrilateral fishing net with square meshes, and the side length of the square is 2-10mm; four corners of the upper net sheet and the lower net sheet are fixed on four piles in quadrilateral arrangement respectively; and the upper net sheet is 3-5cm away from the lower net sheet. According to the size of the upper mesh, a bundle of vallisneria can be exactly inserted into the mesh, and the roots of the vallisneria can be ensured to contact the lower net sheet; and according to changes of the water level and the transparency of water to be repaired, ecological niche is continuously changed so as to overcome the limitation on submerged vegetation restoration by the transparency and improve the repairing effect.