The invention discloses a gas blasting initiator and a fracturing device. The gas blasting initiator comprises a pipe body, a filling cavity, an ignition mechanism and an inflation mechanism, wherein the filling cavity is arranged in the pipe body; the pipe body is in sealing connection with the ignition mechanism and the inflation mechanism; the filling cavity is filled with supercritical oxygen and carbon-containing organic matters or reductive elementary substances; the ignition mechanism comprises a heating wire, a lead wire, a lead wire penetration hole and a sealing matrix; the heating wire is connected with the lead wire; the lead wire penetration hole is formed in the axis part of the sealing matrix; the lead wire penetrates through the lead wire penetration hole through an outer insulating layer; the inflation mechanism comprises an inflation hole, a valve rod and an inflation valve seat; the inflation hole is communicated with the inflation valve seat; a gas locking cavity is arranged at the middle of the inflation hole; the valve rod is mounted in the gas locking cavity; a connecting piece is connected between the inflation valve seat and the sealing matrix. The gas blasting initiator and the fracturing device have the advantages that the manufacture cost is low, the reaction material mixing uniformity is high, the heat release efficiency is high and the transport security is good.