Integrated gas laser

The invention discloses an integrated gas laser. The outside of the two ends of a cavity (1) of the gas laser are respectively provided with endoscope adjustment devices (8) which are used for fixing and retaining an output coupling mirror (4) and a full reflection mirror (6), and respectively wrapping up one of two Brewster windows; and the endoscope adjustment devices (8) are in sealing connection with the cavity (1) in order to form sealing spaces between the output coupling mirror (4) and the cavity (1) and between the full reflection mirror (6) and the cavity (1). The Integrated gas laser can eliminate the deliquescence of the lens material caused by the water vapor in the air, prevents the dust in the air from adhering to the surface of the lens, enables the structure of the laser to be more compact, and outputs high stability laser energy.