Tungsten borides are a class of superhard materials known for their excellent mechanical properties. However, little information is available on their high-temperature friction and wear behavior. In this study, dense compact WB coating was successfully fabricated on a tungsten substrate using powder-pack boronizing process. The tribological behavior of the coating was systematically investigated at temperature range from 400 °C to 800 °C in air, as well as at 800 °C in an argon atmosphere. The sliding tests revealed that, in air, the friction coefficient of WB coating increased considerably from 0.51 at 400 °C to 0.66 at 600 °C, and then decreased sharply to 0.16 at 800 °C. These changes were closely related to the nature of the oxidation products formed on the coating surface. At 400 °C, the ultrahard WB structure was preserved due to its excellent oxidation resistance, and wear primarily occurred on the counterbody. At 600 °C, severe oxidation led to the formation of abundant rod-shaped B 2O 3 and WO 3 debris, which acted as abrasive particles and contributed to the increased COF. At 800 °C, substantial evaporation of B 2O 3 resulted in the formation of a WO 3-rich tribolayer on the wear track and a mixed WO 3-B 2O 3 transfer layer on the counterbody, leading to reduced friction coefficient. Meanwhile, the wear rate increased progressively from 3.7×10 -5 mm 3/N·m at 400 °C to 1.9×10 -4 mm 3/N·m at 800 °C, owing to the enlarged real contact area between the friction pairs. When friction test was conducted at 800 °C under flowing argon atmosphere, the oxidation of the WB coating was significantly suppressed. The formation of lubricating B 2O 3-WO 3 layers on both the wear track-supported by the underlying hard WB coating, and the counterbody effectively prevented direct contact between the friction pairs. As a result, an ultra-low friction coefficient of 0.08 and a reduced wear rate of 7.9×10 -5 mm 3/N·m were achieved.