Abstract: Temperature effect on thermal conductivity of salted bentonite is crucial for the design of deep-earth repositories for nuclear waste. MX80 bentonite powder was salinized and humidified by salt solution, and the thermal conductivity of salted bentonite was measured at different temperatures based on the thermal probe method, and its relative humidity was also analyzed lately. Results showed that: temperature effect on thermal conductivity of salted bentonite is similar to that of pure bentonite, and the thermal conductivity increases with temperature, but the thermal conductivity amplification of salted bentonite is weaker than that of pure bentonite; with the increase in salt concentration but same type, temperature effect on thermal conductivity of salted bentonite is gradually weakening; with the same salt concentration but different salt types, temperature effect on thermal conductivity of salted bentonite is different from each other, showing CaCl2