High pressure water blocking device for down-hole drilling

The utility model discloses a high pressure water blocking device for down-hole drilling used at the time of exploring high pressure water drilling holes in construction under a coal mine well. The utility model comprises a front sleeve pipe, a thread tightening sleeve pipe, a high elastic rubber ring, an expansion boosting strong ring and a rear sleeve pipe, wherein the front end of the front sleeve pipe is provided with a resistance head; the rear end of the front sleeve pipe is fixedly provided with a fastening nut; the thread tightening sleeve pipe is fixedly connected with the rear sleeve pipe through a horn-shaped joint; the high elastic rubber ring and the expansion boosting strong ring are mutually sheathed on the thread tightening sleeve pipe at intervals; the thread tightening sleeve pipe is screwed in the fastening nut. The utility model has the characteristics of quick consolidation, effective water blocking, etc.