Abstract: A foldable light-shielding hood includes a plate body, a first supporting portion, a second supporting portion, a hanging portion, a first folded portion, and a second folded portion. The first supporting portion, the second supporting portion, and the hanging portion are foldably disposed to the plate body. The first folded portion is foldably disposed to the first supporting portion. The second folded portion is foldably disposed to the second supporting portion. The foldable light-shielding hood is adapted for hanging on a portable electronic device through the hanging portion. The first folded portion, the second folded portion, the hanging portion, the first supporting portion, the second supporting portion, and the plate body surround a shielding space, and the first folded portion, the second folded portion, and the hanging portion are adapted for being combined with the portable electronic device, and a display surface is located in the shielding space.