Firstly, stone materials are grinded by coarse-crushing machine. Then, the coarse materials made are conveyed into fine crusher by belt conveyor to be crushed, and the materials made by this step are delt by vibrating screen, which classified two kinds of stones,one kind conveyed into sand making machine, the other are returned to be crushed again. Some of the stones which enter sand making machine are made into finished sands, others shall be crushed again. III. Features Sand production line: highly automation, low operating cost, high crushing rate, energy saving, large output, little pollution, convenient maintenance