Coal-bed gas well drainage and mining structure

The utility model discloses a coal-bed gas well discharging and mining structure which is characterized in that during well washing and jam releasing, liquid is injected into a first hollow rod through a well washing water injection pipeline, flows to the upper part of a check valve through the first hollow rod, a second hollow rod and a third hollow rod in sequence, flushes the check valve and takes away pulverized coal or other substances deposited on the check valve; a pumping unit drives a first hollow rod to move upwards, a third hollow rod drives a first sealing plunger to open a valve hole of a valve seat, liquid carries pulverized coal or other substances to enter an upper cavity, the pumping unit drives the first hollow rod to move downwards, and the pumping unit drives a second sealing plunger to open the open end of a piston. Liquid carrying pulverized coal or other substances is discharged to the oil pipe through the liquid outlet of the piston and is discharged through the drainage pipeline commu