Gas explosion seismic source reflection device and exploration process

The gas explosion seismic source reflection device comprises a cavity, a top cover and an igniter, the cavity and the top cover are provided with an inner limiting pipe and an outer limiting pipe respectively, the igniter is installed on the inner limiting pipe and the outer limiting pipe, an ignition wire at the head of the igniter extends into the cavity, the portion, in the cavity, of the inner limiting pipe is provided with a one-way valve piece, and the one-way valve piece is installed on the top cover. A one-way valve piece is arranged in the cavity, a top head of the igniter abuts against the one-way valve piece, a locking assembly is arranged on the top cover, a shackle assembly is arranged on the top cover, an unlocking rope is connected to the top end of the igniter, and the other end of the unlocking rope penetrates through the shackle assembly with the horizontal height lower than that of the top end of the igniter. The cavity is formed in the igniter, the igniter is fixed in the cavity through th