Abstract: Numerical simulation has been widely used in recent years to investigate the temperature field characteristics of sintering furnaces, which makes up for the limitations of traditional experimental methods in acquiring temperature field data in high-temperature sintering furnaces. In this study, a transient temperature field numerical model of a hard alloy vacuum sintering furnace was established. Numerical simulation of the transient temperature field during the vacuum heating and sintering process of cemented carbide was performed, and the transient temperature fields at different time points inside the furnace were obtained. Comparison with measured data showed that the maximum error was within 3%. On this basis, the temperature uniformity of hard alloy workpieces on different tray layers during and at the end of the sintering process was further analyzed. The results indicate that the holding stage in the sintering process can effectively improve the temperature uniformity of the workpieces. While, the temperature uniformity of the workpieces located on the middle tray layer is significantly poorer compared to that on the upper and lower tray layers. Assuming that the middle tray layer is a plane of symmetry, the average, maximum, and minimum temperatures of workpieces between trays are approximately symmetrically distributed. This study provides a reference for improving he temperature uniformity of workpieces of workpieces in hard alloy vacuum sintering furnaces.