The invention provides a stone processing device which comprises a feeding unit, a preliminary pulverizing unit, a secondary pulverizing unit and a material collecting unit, wherein the feeding unit comprises a first motor bracket, a first motor, a first belt wheel, a raw material conveying belt, a second motor bracket, a second motor, a second belt wheel and a feeding funnel; the preliminary pulverizing unit comprises a first supporting platform, a second supporting platform, a pulverizer frame, a fixed stone pulverizing knife, a third motor, a runner, a driving crank, a movable stone pulverizing knife, a movable stone pulverizing knife fixing seat and a funnel; the secondary pulverizing unit comprises a fourth motor, a first rotating disc, a second rotating disc, a first extrusion cylinder, a second extrusion cylinder, a fifth motor and a discharging funnel; the material collecting unit comprises a sixth motor support frame, a seventh motor support frame, a sixth motor, a seventh motor, a sixth belt wheel, a seventh belt wheel, a finished product conveying belt and a finished product collecting cabinet. The stone processing device is simple in structure, relatively low in cost, and convenient and practical in use; when the device is in use, stones can be pulverized completely, the processing efficiency is high, and the processing effect is good; besides, the device is compact in structure, small in occupied area and easy to mount.