The invention discloses a gas extraction and hole drilling device. The operation is simple, the practicability is high, integration of drilling hole and extraction is achieved, rapid punching is carried out by rotating a drill assembly, an extraction barrel is inserted into the drilling hole together, in the process of drilling hole, water is injected into an extraction inner cavity by using a high-pressure water pump, the overflowing water is ejected through small holes, so that flying of coal dust in the drilling hole is restrained, the situation that a large amount of the coal dust containsin extracted gas is avoided, through the cooperation of a filter screen and a discharging pipe, larger particle coal in the extraction process is conveniently filtered, so that the problem of blockage caused by excessive agglomeration of the larger particle coal is solved. In addition, a mode of external main drill revolution and internal sub-drill rotation is adopted, so that the drilling efficiency is greatly improved, the high-efficiency drilling of hard rock layer is realized, the drilling efficiency is high, and the internal sub-drill is convenient to change.