The tube sinking with a rotatory die is an essential process for thin-walled copper tube to manufacture ultra-thin micro heat pipe. For the copper tubes with the outer diameter of Φ5 mm and the wall thickness of 0.1, 0.2 and 0.3 mm respectively, the influences of die rotation speed, die feed speed and wall thickness of copper tube on the quality of tube sinking were studied experimentally. The results show that under this process, the copper tubes have three forming phenomena such as smooth forming, regular crushing and bending. When the certain other parameters are fixed, increasing the die feed speed causes the copper tube to undergo a transition from smooth forming to regular crushing, then to bending, and reduces the length of formed area. Then, increasing the die rotation speed enlarges the length of formed area and the critical feed speed. And increasing the wall thickness of copper tube magnifies the bending length to a certain extent. When the wall thickness of copper tube is increased from 0.1 mm to 0.2 mm, the improvement effect is obvious, but when the wall thickness of copper tube is increased from 0.2 mm to 0.3 mm, there is no significant change. In the experiment, the forming quality and the production efficiency are both good under the optimal process parameters with the die rotation speed of 4800 r·min-1 and the die of feed speed for 50 mm·s-1. Thus, based on finite element software ABAQUS, the simulation model of tube sinking with a rotatory die for copper tube is built up to assist the analysis of the forming process and verify the experimental results.