Gas leakage prevention device for fracture of natural gas well under influence of roadway tunneling

The invention discloses a gas leakage prevention device for fracture of a natural gas well under the influence of roadway tunneling, which comprises a central pipe, an upper connecting pipe and a lower connecting pipe, the mounting seat is embedded into the middle part of the central pipe; the in-pipe plugging assembly is arranged on the mounting seat and is used for plugging the central pipe; and the outside-pipe plugging assembly is arranged outside the central pipe in a height-adjustable sleeving manner and is used for plugging the well body. 本发明公开了巷道掘进影响下天然气井破断防漏气装置，包括：中心管，其上端一体成型有上接管，下端一体成型有下接管；安装座，其嵌入至所述中心管的中部；管内封堵组件，其设置于所述安装座上，用于封堵所述中心管；以及管外封堵组件，其可调高度的套设于所述中心管的外部，且用于封堵井体。