Disclosed is a rotary door worktable of a pipe expander. A hanging door, for fixing workpieces, disposed on the worktable, is designed into the door with two working faces A and B and capable of rotating 180 degrees, and thus feeding and discharging operations of the workpieces can be performed on the working face B of the hanging door when pipe expanding operation is performed on the working face A of the hanging door, and the working faces A and B are turned by 180 degrees in facing direction to enter the next work cycle after the pipe expanding operation on the working face A is finished and the workpieces are fed to the working face B. Accordingly, production efficiency of equipment and work efficiency of working staff are improved.