PERFORATED AIR-DUCT FOR GRAINS DRYING TOWER, referring to a trough (1) in V form, made-up by two vertical lateral faces (2), united by two converging superior faces (3), the faces being provided with a multiplicity of openings (5), which reduce the grains column between the trough layers (1) in the tower, which increases the drying speed because the grains thickness is finer, consequently reducing the drying time.