Stone filling construction device in large caisson and using method thereof

The invention relates to the technical field of offshore caisson stone filling construction, in particular to a stone filling construction device in a large caisson and a using method thereof. The stone filling construction device in the large caisson comprises a supporting frame body installed on a barge, a stone screening structure is arranged on the supporting frame body, a belt conveying device is arranged at an available stone discharging opening of the stone screening structure, the input end of the belt conveying device is rotationally connected with the supporting frame body, and the height of the output end of the belt conveying device can be adjusted in the vertical direction. The device can adapt to a construction area with large caisson size, frequent sea tidal range change and large tidal range, can be adjusted at any time according to the height of the caisson, can be adjusted according to the specification of stones in the caisson, meets the engineering quality requirement, can remarkably impro