Variable-diameter drill hole dynamic pressure water burst rapid plugging device and using method

The invention discloses a variable-diameter drill hole dynamic pressure water burst rapid plugging device and a using method, and relates to the technical field of underground hot water resource exploiting.The lower portion of the outer wall of a casing pipe is fixedly sleeved with a fixed support, and the fixed support is used for abutting against a step of a drill hole and dividing the drill hole into two parts in the axis direction; the water stop plate is used for being arranged on the upper portion outside the casing pipe in a sleeving mode and making contact with the ground, all the grouting pipes penetrate through the water stop plate and extend into a drill hole, and the positions, extending into the drill hole, of the multiple grouting pipes are different from one another; the bottom end of the orifice pipe is connected with the top end of the sleeve, the side pipe is arranged on one side of the orifice pipe, the second valve is arranged on the side pipe, the mixing pipe is connected with the side, a