Abstract: Multi-duct exhaust device for a turbomachine, of the multi-duct type with an annular inlet 4, comprising an outer casing 3 shaped symmetrically overall with respect to an axis and one or more internal partitions 5 defining several roughly concentric ducts 7, 8 for the exhaust stream to flow through, characterized in that an absorbent coating 14, 15, 17, capable of absorbing some of the acoustic energy generated by the flow is provided on at least one surface of one internal partition 5 and/or on the interior surface of the outer casing 3.