Mixing device and hydrogen production system in coal chemical industry

The invention relates to the field of coalification devices, and discloses a mixing device and a coal chemical hydrogen production system. The mixing device comprises a first pipeline (1), a rotary mixing inner part and a blocking part (3); the first pipeline is provided with a first pipeline inlet (11), an auxiliary material port (13) and a first pipeline outlet (12), and the auxiliary material port is perpendicular to the first pipeline inlet; the blocking piece (3) is fixedly installed on the inner wall, close to an outlet of the first pipeline, of the first pipeline. The rotary mixing internal part is located in the first pipeline between the auxiliary material opening and the blocking part and comprises a plurality of spinning discs (2) which are arranged in the length direction of the first pipeline and are sequentially connected in series to form a curve channel extending along the first pipeline. The mixing device can effectively slow down pipeline scaling; the mixing effect is improved; the mixer blo