The invention provides an air purifying device. The air purifying device comprises a purifying tank, a pressurizing device, a mixing device and a water circulation system, wherein the mixing device isarranged in the closed purifying tank, the pressurizing device outside the purifying tank is connected with the mixing device, the water circulation system is communicated with the purifying tank, animpeller in the purifying tank rotates to exhaust gas, and the gas is mixed with water to purify the air. The air purifying device solves the problem that an original air purification device is poorin effect and low in efficiency and does not save the energy or protect the environment, and has the advantages that the structure is simple, the air purification effect is good, the efficiency is high, the energy is saved, the environment is protected, and the operation is simple.