The invention provides underwater covered canal silt efficient transport equipment which comprises a desilting pipeline, a plurality of silt drawing cavities bound by connecting pieces side by side, and water inlets for guiding water into the silt drawing cavities; the upstream tail ends of the silt drawing cavities are connected with the water inlets through transition sections; the downstream tail ends of the silt drawing cavities are connected with the desilting pipeline through downstream end connection transition sections; the water inlets are cylindrical, are formed upwards vertically and are perpendicular to the axes of the silt drawing cavities; the desilting pipeline is connected with the existing desilting holes or flood discharge bottom holes of a reservoir in a closed manner; the bottoms of the silt drawing cavities are not closed; and the cross sections of the silt drawing cavities are horseshoe-shaped. A water flow free of silt passes through the water inlets at a high flow rate and enters the bottom-opened silt drawing cavities bound side by side in a concentrated manner, and directly scour the silt at the bottom of the reservoir, and the water flow, which contains a lot of silt, passing through the silt drawing cavities is discharged downstream through the flexible desilting pipeline. With the adoption of the underwater covered canal silt efficient transport equipment, reservoir bottom flexible desilting at a wide range can be realized, the desilting is not restricted to a certain spot at the front of a dam, and the recovery of the storage capacity damaged by the silt can be realized effectively.