The invention discloses a drill hole inside secondary grouting leaking stoppage device. The drill hole inside secondary grouting leaking stoppage device comprises an injection pipe composed of a plurality of single-section pipes which are connected in sequence, all the single-section pipes comprise gas injection pipes and grouting pipes, the grouting pipes are arranged inside the gas injection pipes in a sleeved manner, wherein the grouting pipes are connected with the grouting pipes, the gas injection pipes are connected with the gas injection pipes, the inner ends of the multiple mutually-connected gas injection pipes stretch out of the inner end of a gas extraction pipe, get over a fracture zone of a drill hole and are connected with and communicate with an inner end gasbag, the parts,located at the inner end of the gas extraction pipe, of the multiple mutually-connected gas injection pipes are connected with and communicate with an outer end gasbag, the gas extraction pipe and oneend of an inlet of the drill hole are further provided with a sealing body, the ends, located at the drill hole inlet, of the multiple gas injection pipes of the injection pipe are connected with gassupply equipment, and the ends, located at the drill hole inlet, of the multiple grouting pipes of the injection pipe are connected with grouting equipment. By means of the drill hole inside secondary grouting leaking stoppage device, precision grouting with pressure can be performed on the failure drill hole fracture development position, so that the gas extraction failure drill hole extractionfunction is activated and restored, and the gas extraction concentration and purity are increased.