Gas mixer

The utility model provides a gas mixer which comprises a sealing cavity and a mixing structure arranged in the sealing cavity, and two ends of the sealing cavity are provided with a gas inlet and a gas outlet. The mixing structure is used for mixing gas and comprises a middle shaft and a plurality of fin sets arranged on the middle shaft at equal intervals. Each fin set comprises two fins perpendicular to each other, and every two adjacent fins located on the same side of the middle shaft are perpendicular to each other to form a 90-degree baffling channel. Gas to be mixed can be repeatedly baffled by the 90-degree baffling channel to form turbulent flow; the turbulent flow drives the gas, so that the gas with different components is fully and uniformly mixed, the flow resistance is reduced, and the gas mixing efficiency is improved. And meanwhile, the 90-degree baffling channel does not turn, so that a flow field dead angle is not easy to generate, and the flow resistance can be further reduced. 本实用新型提供了一种气体