The invention relates to a gas lift double-shaft slot forming machine, which comprises a high-pressure gas inlet pipe, a grout outlet bent pipe, a grout outlet steel pipe and two guide tracks fixed on two sides of the grout outlet steel pipe, wherein a hydraulic motor A is in shaft connection with a power shaft A, and a hydraulic motor B is in shaft connection with a power shaft B; and the two hydraulic motors and two support shaft sleeves are fixed on a cross beam, and the two power shafts are provided with a plurality of T-shaped knives respectively. The gas lift double-shaft slot forming machine is a special tool for slot formation of underground continuous walls.