Marking device for flaw detection of precise internal thread copper pipe

The invention relates to the technical field of marking equipment, in particular to a marking device for flaw detection of a precise internal thread copper pipe, which comprises a laser marking structure for marking the copper pipe, two groups of conveying structures for horizontally conveying the copper pipe and a positioning structure for positioning the axis position of the copper pipe, the laser marking structure comprises an arc-shaped top plate playing a supporting role, after the copper pipe is positioned, the arc-shaped top plate is coaxial with the copper pipe, and a first sliding block is arranged on the arc-shaped top plate in a sliding mode in the arc-shaped direction of the arc-shaped top plate; by adopting the mode that the laser transmitter moves in an arc shape in the circumferential direction of the copper pipe and then is matched with transverse movement of the copper pipe, all-directional and deformation-free marking on the circumferential outer wall of the copper pipe can be achieved, it i