High-low pressure coupling pressure hole sealing device

The utility model discloses a high and low pressure coupling pressurized hole sealing device which comprises a hole protecting pipe, the hole protecting pipe is composed of a hole protecting solid pipe, a hole protecting screen pipe, a hole protecting solid pipe and a hole protecting pipe flange pup joint which are sequentially connected from back to front, the hole protecting pipe is arranged in a drill hole of a coal body, and the hole protecting solid pipe located at the rear end of the hole protecting pipe extends into the bottom of the drill hole. The outer wall of the front end and the outer wall of the rear end of the hole protecting solid pipe located at the front end of the hole protecting pipe are each provided with a Penbo hole sealing bag, the gap between the hole protecting solid pipe and a drill hole can be sealed through glue exploding of the Penbo hole sealing bags to form a closed space, and the outer side of the hole protecting pipe is provided with an outer slurry returning pipe and an oute