The products are mainly for the construction of highways, railways, bridges, tunnels high standards of engineering, used to wash aggregate of specialized equipment, than the domestic similar products, with ease of movement, processing power, and clean high rate of savings in power and so on. Applicable to fine-grained and coarse-grained materials of the washing operation. Stone washing machine in the rational structure, convenient maintenance, handling a large amount of power consumption in small, clean and high. Novel seal structure, the new shaft installed, adjustable septic tanks to ensure that the product efficiency, durability, cleaning, dewatering effect, and fine-grained features such as product stability. Stone washing machine working principle: work, through the v-belt motor, reducer, gear reducer drive, after a slow rotating drum sieve, stone loader into the hopper, in the drum roll, driven by screening and grinding with each other, except gravel surface coverage impurities, while adding water to form a strong water flow, in time, a small proportion of impurities and foreign bodies removed, and exports from the overflow from wash tank to complete the cleansing effect. Clean away gravel from a conveyor belt to complete the cleansing role of gravel.