Packing device for water pressure test of large-diameter drill hole

The utility model provides a packing device for a large-diameter drill hole water pressure test, which comprises a concrete drill hole test section, a drill rod is arranged at the lower end in the drill hole test section, a pre-tightening sleeve with an up-down two-way threaded hole is arranged above the drill rod, a large-diameter circular ring gasket is arranged above the pre-tightening sleeve, and a large-diameter circular ring gasket is arranged above the large-diameter circular ring gasket. An inner core pipe is arranged above the large-diameter circular ring gasket, a plurality of expansion assemblies are sequentially arranged on the periphery of the inner core pipe in a sleeving mode from top to bottom, a large-diameter positioning plate is arranged above the inner core pipe, a fixing mechanism is arranged above the large-diameter positioning plate, a connecting pipe is arranged above the fixing mechanism, and a two-way connector is arranged above the connecting pipe. The large-diameter circular ring g