The utility model discloses a laser gyro cavity belt cleaning device, including being used for bearing the weight of the fixed frock of cavity of laser gyro cavity, the vacuum table who is used for making the interior helium -neon gas discharge's of cavity DC power supply and is used for the interior gaseous replacement of cavity, still be used for first external plate electrode and the external plate electrode of second for cavity load radio frequency energy on lieing in cavity both sides terminal surface respectively, vacuum table is connected with the cavity is airtight, and first externalplate electrode and the external plate electrode of second have connected gradually radio frequency adapter and radio -frequency power supply through the coaxial cable, the utility model discloses make every capillary hole of cavity all obtain glow discharge cleaning, radio frequency glow discharge cleaning's process does not receive laser gyro's self discharging system's restriction, and convenience, process time weak point, the effectual life who lengthens laser gyro are adjusted to ability gauge height, the power level of the RF plasma body.