Airtight corner oil cylinder

The utility model discloses an airtight corner oil cylinder, which belongs to the technical field of gas detection devices and comprises a cylinder body, and a detection component for gas detection is mounted at the lower end of the cylinder body. A moving assembly used for moving is installed in the cylinder body. The detection assembly comprises a first end cover, a gas detection assembly, a limiting seat, a limiting ring and a second end cover, the limiting seat is embedded into a lower end cavity of the cylinder body and fixedly connected with the cylinder body, the lower end of the limiting seat is fixedly connected with the first end cover, the first end cover is connected with the gas detection assembly, and the limiting seat is connected with the moving assembly; the limiting ring is arranged at the upper end of the limiting base in a sleeving mode and makes contact with the inner wall of the cavity of the cylinder body in an attached mode, the lower end of the first end cover is fixedly connected wit