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A coal mine underground gas liquor pressure relief separator mainly comprises a spiral pressure reduction bin 2, a double-layer annular sieve aperture eliminator plate 3, a water and slag collection cylinder 6, an inverted cone cutting type automatic slag discharging outlet 7 and an automatic overflow water outlet 8. A high-pressure gas liquor mixture enters the spiral pressure reduction bin, water and slime sink under the action of a spiral flow deflector, flow into the water and slag collection cylinder, and are discharged through the inverted cone cutting type automatic slag discharging outlet, and an overflow water valve is automatically opened when the water amount is too much; and the upper portion of the spiral pressure reduction bin is connected with the annular sieve aperture eliminator plate, water spray and a gas generated by jetting water are separated, and the gas is introduced to an extraction system through a collection chamber. The separator aims at high pressure water carrying slime and gas, can rapidly reduce the pressure of the gas liquor mixture, and is an automatic device for effectively realizing the separation of coal, water and gas; and the separator makes the gas separated in the cylinder smoothly enter an underground extraction pipeline, can guarantee the safe and efficient running of an extraction system, and can avoid the gas over-limit caused by the entrance of toxic and harmful substances to an underground working surface.