Automatic gas pipe joint locking device

The invention discloses an automatic gas pipe joint locking device which comprises a workpiece fixing seat; a first linear guide rail horizontally extending left and right is arranged above the workpiece fixing seat; a first linear sliding block is in sliding fit with the first linear guide rail; a first follow-up frame is arranged on the first linear sliding block; a second linear guide rail vertically extending up and down is arranged on the first follow-up frame; a second linear sliding block is in sliding fit with the second linear guide rail; a second follow-up frame is arranged on the second linear sliding block; a motor is arranged on the second follow-up frame; a locking rod vertically downwards is linked with the output shaft of the motor; a locking groove is formed in the bottomof the locking rod; and a first telescopic air cylinder capable of controlling the second follow-up frame to do vertical up-down motion is arranged on the first follow-up frame. The automatic gas pipejoint locking device has