NOVELTY - Coal bed methane well blowout workover device comprises: a closed perforation casing, which is internally connected with discharge liquid jet injection port and discharge liquid jet discharging port; a pressure measuring device for measuring pressure inside the liquid jet; and a liquid flow meter, provided on the spray liquid discharging port. The discharge liquid jet injection port is opened and the discharge liquid jet discharging port is closed until the pressure inside the casing is higher than 0.1 MPa.    USE - Used as a coal bed methane well blowout workover device.    ADVANTAGE - The device avoids deposition of coal or coal sand and impurity in the gaps, and increases the mining efficiency of coal bed.    DETAILED DESCRIPTION - Coal bed methane well blowout workover device comprises: a closed perforation casing, which is internally connected with discharge liquid jet injection port and discharge liquid jet discharging port; a pressure measuring device for measuring pressure inside the liquid jet; and a liquid flow meter, provided on the spray liquid discharging port. The discharge liquid jet injection port is opened and the discharge liquid jet discharging port is closed until the pressure inside the casing is higher than 0.1 MPa; closing the discharge liquid jet injection port and opening the discharge liquid jet discharging port, and controlling the pressure inside the casing by liquid flow meter to 0-50 MPa. An INDEPENDENT CLAIM is also included for coal bed methane well blowout workover process, comprising closing discharge liquid jet discharge port, injecting spray liquid from discharge liquid jet injection port into the closed ends of the perforated casing, spraying liquid through casing until the pressure of inner casing is higher than 0.1 MPa, maintaining for 0-480 minutes; then closing the discharge liquid jet discharge port and opening the discharge liquid jet discharge port, controlling the discharge of spraying liquid via liquid flow meter, until the pressure of discharge liquid jet inside the casing is 0-50 MPa.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of the coal bed methane well blowout workover device.