In the process of drilling， when circulation loss occurs due to large fractures or small karst caves where plugging materials cannot work effectively， controllable plugging tools are an effective plugging method. In view of this severe circulation loss， we designed a kind of plugging tool which can be easily manipulated and can accurately deliver the interception bag and different types of plugging materials to the leakage position in the borehole. The tool can effectively prevent the plugging material from being diluted by water or washed away by water flow， and form effective plugging at the leakage position， so as to realize the plugging of large fractures.