Experimental device for coal seam fracturing combined biological yield increase

The invention relates to a coal seam fracturing combined biological yield increasing experimental device which comprises a raw material liquid unit, a conveying unit, an experimental unit and a detection unit which are sequentially connected, the raw material liquid unit comprises a blending and mixing tank and a plurality of raw material tanks, and the raw material liquid unit is used for inputting bacterial liquid, nutrient liquid, fracturing liquid and coarse and fine sand into the blending and mixing tank; the blending and mixing tank is connected with the experiment unit through a pump of the conveying unit, different raw material solutions are input into the experiment unit, and biological yield increasing and fracturing experiments are carried out; the experiment unit comprises a plurality of experiment grooves connected in parallel and used for conducting experiments respectively, an outlet of each experiment groove is connected with the conveying unit through a pipeline, and circulation experiments o