The invention discloses an unloading device used for port operation. The unloading device comprises a bottom plate. A supporting frame is arranged on the upper surface of the bottom plate. A first motor is arranged on the lower side of the supporting frame. A containing frame is arranged on the top of the supporting frame. A conveyor belt is arranged in the containing frame. The two ends and the middle portion of the conveyor belt are each provided with a rolling shaft. A rotating shaft of the first motor is in transmission connection with the rolling shafts through transmission assemblies. A partition plate is arranged on one side of the containing frame. A second motor is arranged on the lower side of the partition plate. A rotating shaft of the second motor is in transmission connection with a rolling shaft at the bottom of the partition plate through a transmission assembly. A slide plate is arranged on the lower side of the partition plate. The two sides of the slide plate are each provided with an electric telescopic rod. By means of the unloading device used for port operation, goods only need to be placed on the supporting frame without being manually carried, a lot of manpower and material resources can be saved, cost is reduced, the work efficiency is improved, greater benefits can be achieved, and the unloading device is simple in structure and convenient to use.