Energy-saving ball mill has made a great improvement in the structure compared to the traditional ones. Its cylinder and supporting fame compose an integral system, thus, when it is being fixed, Energy-saving ball mill will be hung on the foundation once. Equipped with double-tiered centripetal roller bearing, its power consumption will be reduced by 30%. The intrinsic grill pattern forcing discharge is replaced by overall pattern controlling discharge, which enhances the fineness of final product, and meanwhile increase the capacity by 15-20%