In order to ensure the same diameter pipe connection with high sealing and firm welding，it is often necessary to carry out the pipe expanding process. Therefore, a set of expansion pipe production line was designed,which adopted programmable logical controller (PLC) as the control core.With hydraulic equipment as expanding kinetic energy for expansion pipe, equipped with the solenoid valve, five states run were realized to ensure the quality of processing speed and expansion pipe.The pneumatic device was used to constitute a manipulator to realize the X、Y、Z three axial movements and take put artifacts.Practice shows that this production line has characteristics of high processing speed, high stability, high accuracy and low expansion rate of pipe, and etc., which has certain promotion value.