Gas mixing distributor and fixed bed reactor

The utility model discloses a gas mixing distributor and a fixed bed reactor, and belongs to the technical field of chemical catalytic reaction. The gas mixing distributor comprises an annular gas distribution pipe, a first drainage pipe, a second drainage part and a mixed drainage part, a plurality of first gas distribution holes are formed in the wall of the annular gas distribution pipe; the lower end of the first drainage tube is communicated with the annular gas distribution tube; the second drainage part is coaxially arranged below the annular gas distribution pipe, the inner diameter ofthe upper end of the second drainage part is smaller than the outer circle diameter of the annular gas distribution pipe, and the second drainage part is coaxially arranged at the upper end of the inner cylinder of the fixed bed reactor and communicated with the gas inlet; the mixed drainage part is coaxially arranged above the annular gas distribution pipe, the inner diameter of the lower end ofthe mixed drainage part i