The invention discloses a two-pole-adjustable gas inlet vortex generating device. The two-pole-adjustable gas inlet vortex generating device comprises a gas inlet branch tube, a vortex blade, a rotaryshaft, a rotary cylinder, a synchronous toothed belt, a supporting wheel, a pulling rope, a torsion spring, a sealing strip, a drive gear and a key slot. According to the two-pole-adjustable gas inlet vortex generating device disclosed by the invention, the vortex blade is additionally arranged in a gas inlet system, and the blade can be regulated to be erected and dropped according to a low-rotation-speed working condition and a high-rotation-speed working condition of a diesel engine, so that requirements, on gas inlet vortex strength, under different working conditions of the diesel engineare met. Compared with the prior art, the two-pole-adjustable gas inlet vortex generating device overcomes the problem that the size of the vortex cannot be changed according to the working conditionof the engine while vortex is generated. Moreover, a vortex mechanism is mounted on the outer wall of the gas inlet branch tube, and gas inlet resistance of the engine is not increased, so that the engine controls vortex in the cylinder under various working conditions, and combustion is organized to keep relatively good fuel oil economical efficiency, dynamic property and emission performance.