Drill-hole waterstop device and method

The invention relates to a drill-hole waterstop device. The drill-hole waterstop device comprises a drilling machine, a drill pipe, a packer and a casing pipe, wherein the drill pipe is connected withthe drilling machine, one end of the drill pipe is connected with a slurry supply device, the other end of the drill pipe is used for extending into a drill well, the packer is arranged on the drillpipe in a sleeving mode and located in the drill well, the packer communicates with an air supply unit, the casing pipe is arranged on the periphery of the packer in a sleeving mode, and a certain gapis left between the casing pipe and the inner wall of the drill well. The slurry supply device is used for injecting slurry into the drill well through the drill pipe, and the packer is configured tobe that when the air supply unit supplies air to the packer, the packer expands and the size of the packer is increased, so that a channel between the drill pipe and the casing pipe is closed. The invention further relates to a