The present invention relates to a multi-coal layer independent gas-containing system pressure control single pump type drain gas mining device and a drain gas mining method, including an inner sleeve and an outer sleeve, an oil pipe installed inside the inner sleeve, and an oil pipe inside A circus rod is installed, and a conduit pump is connected to the lower end of the circus rod, a sand sedimentation pipe is installed at the bottom of the conduit pump, and a sieve pipe is further installed above the sand sedimentation pipe; Packer 1 and Packer 2 are installed between the inner sleeve and the outer sleeve; A pressure gauge cable and an annular flow rate limiting valve cable are further fixedly installed on the inner sleeve inner pipe wall, and a pressure gauge is connected to the lower end of the pressure gauge cable, and the pressure gauge is fixedly installed at the lower end of the inner sleeve inner wall, and the annular flow rate limiting valve cable It is characterized by connecting an annular flow limiting valve for each independent gas-containing system at the lower end. The present invention controls the amount of water flowing into the inlet of the inner sleeve pump by installing an annular flow limiting valve; The co-planar auxiliary pipe isolates the gas produced by each independent gas-containing system, and a gas flow meter is installed on top of the co-planar auxiliary pipe to monitor the gas output of each gas-contained system.
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