Abstract: The temperature effects of thermal conductivity of salted bentonite are crucial for the design of deep-earth repositories for nuclear waste. MX80 bentonite powder is salinized and humidified by salt solution, the thermal conductivity of salted bentonite is measured at different temperatures based on the thermal probe method, and its relative humidity is also analyzed later. The results show that the temperature effects of thermal conductivity of salted bentonite are similar to those of pure bentonite, and the thermal conductivity increases with temperature, but the increase in the thermal conductivity of salted bentonite is weaker than that of pure bentonite. With the increase in the salt concentration with the same type, the temperature effects of thermal conductivity of salted bentonite are gradually weakened. Under the same salt concentration with different salt types, the temperature effects of thermal conductivity of salted bentonite are different from each other, showing CaCl₂ < NaCl < KCl. The evolution mechanism of the temperature effects is attributed to that salt reduces the relative humidity in pore gas, partially offsetting the contribution of temperature to thermal conductivity through latent heat transfer.