Preparation of high-performance bentonite lubricating grease

Disclosed is the preparation of a bentonite grease with good performance which comprises bentonite of 5 to 20%, base oil of 80 to 95%, phosphoric acids of 1 to 3%, antirust agents of 1 to 4%, covering agents of 1 to 4%. The present invention has a high thermal stability with no apparent drop points, also provided with a good viscous nature and a cone penetration not changing much with the temperature, and good properties in shear stability, anti-water, colloid stability and rust proof performance.