Abstract: The distribution and change rule of the temperature of the new, old slag pots and the slag stored inside during cooling process were obtained by transient thermal analysis using ANSYS simulation software. The results show that the new slag pot has better cooling effect and thermal fatigue strength. Compared with those of the old pot tank, the temperature of the new slag pot is lower after 3 h cooling, and the slag temperature in the pots decreases faster. This indicates that the structure design of the new slag pot in which six partitions are used to divide the old slag pot into six cavities can better improve thermal fatigue strength and subsequent treatment of steel slag. In addition, the coupling analysis of heat and structure shows that the thermal stress of both the new and old slag pots can meet the requirements of high temperature strength.