Drainage and mining control method and device based on high-rank coal bed gas fractured horizontal well

The invention discloses a drainage and mining control method and device based on a high-rank coal bed gas fractured horizontal well, and relates to the technical field of drainage and mining of high-rank coal bed gas. The method comprises the steps that in response to the fact that the gas drainage process is in a drainage stage, the drainage stage is divided according to the corresponding relation among a flowing bottomhole pressure value, an original pressure value of a stratum and a transition pressure value of gas, at least two drainage sub-stages are obtained, and the flowing bottomhole pressure value is reduced according to the first drainage rate corresponding to each drainage sub-stage; in response to the fact that the gas discharge and production process is in the yield increasing stage, the flowing bottomhole pressure value is reduced according to the second discharge and production rate, and gas desorbed from the stratum is collected; and in response to the stable production stage of the gas discha