The calibration and cooling system is essential to the production process of extruded plastic pipes be-cause it determines the length of plastic pipe production line and the product quality.In this paper,according tothe temperature data of the outer wall,the calibration and cooling process of an extruded plastic pipe is simulatedwith the transient thermal analysis unit of ANSYS software in the combination of Newton’ s cooling law and theclamp force method.Afterwards,the convective heat transfer coefficients of three spray cooling water tanks in thecooling section of the plastic pipe,as well as the temperature field variation during the cooling process,areobtained,and an energy- saving analysis of the whole calibration and cooling system is conducted.The results indicatethat,from the viewpoint of energy consumption of a single tank,the convective heat transfer coefficients in currentoperation conditions is rather reasonable,however,from the viewpoint of energy consumption of the whole coolingequipment,the third cooling water tank plays slight role in the whole cooling process and the cold energy is seriouslywasted.