Fracturing gas injection device

The utility model discloses a fracturing gas injection device, which is arranged in an extraction drill hole and comprises a first packer, a second packer, a third packer, a liquid injection pipeline, a gas injection pipeline, an acidification permeation enhancing liquid storage tank, a high-pressure pulse pump and an air compressor, and the first packer, the second packer and the third packer are sequentially arranged in the extraction drill hole. The outer end of the liquid injection pipeline and the outer end of the gas injection pipeline are connected with one end of a main pipeline, and the two branch pipelines are respectively communicated with an acidizing and permeability-increasing liquid storage tank and an air compressor, the three packers are arranged, a fracturing section and a gas injection section are formed in a drill hole, acidizing and permeability-increasing liquid is injected into the fracturing section through the liquid injection pipeline for acidizing and fracturing, and the acidizing a