The invention relates to a reinforced high-aperture-ratio faceplate for a railway metal sound barrier and belongs to the technical field of noise treatment in the field of environmental protection. The reinforced high-aperture-ratio faceplate comprises an aluminum alloy faceplate body, an I-shaped strip and punched holes, wherein the I-shaped strip is welded with the inner side of the aluminum alloy faceplate body, and the punched holes are formed in the aluminum alloy faceplate body and are rounded rectangular holes. The reinforced high-aperture-ratio faceplate adopts the rounded rectangular holes to achieve high aperture ratio of the sound absorption face plate, the comprehensive aperture ratio is up to 39%, and the additional 1.3dB noise reduction amount can be increased compared with a conventional rounded-punched-hole faceplate. In addition, the aluminum alloy faceplate is reinforced by using the aluminum alloy I-shaped strip, the equivalent thickness of the aluminum plate with the thickness of 1.5 mm is up to 4.2 mm, the rigidity of the face plate is high, the load-resistant capacity is strong, and the plate face is flat and attractive.