Waste gas mixing device with high uniform mixing degree

The waste gas mixing device with the high uniform mixing degree comprises an air inlet manifold and a mixing pipe, the top of the air inlet manifold is provided with an inserting pipeline, the top of the inserting pipeline is in sealing fit with the bottom of a mounting flange, the bottom of the mounting flange is fixedly connected with the mixing pipe which is of an integrated structure with the mounting flange, and the mixing pipe is arranged in the inserting pipeline; the outer wall of the mixing pipe is in sealing fit with the inner wall of the inserting pipeline, the upper portion of the mixing pipe is communicated with the interior of the inserting pipeline through a mixing pipe air inlet, and the lower portion of the mixing pipe is communicated with the interior of the air inlet manifold through a plurality of waste gas flow dividing openings. A closed waste gas channel is formed in one side of the top of the intake manifold, a waste gas inlet is formed in one end of the waste gas channel, and the othe