The utility model provides a stone processing device. The stone processing device comprises a feeding unit, a primary crushing unit, a secondary crushing unit and a 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 hopper; the primary crushing unit comprises a first support platform, a second support platform, a crushing rack, a fixed stone crushing knife, a third motor, a rotating wheel, a transmission crank, a movable stone crushing knife, a movable stone crushing knife fixing base and a hopper; the secondary crushing unit comprises a fourth motor, a first turntable, a second turntable, a first extrusion barrel, a second extrusion barrel, a fifth motor and a discharging hopper; the 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, lower in cost, convenient and practical. When the stone processing device is used, stone can be fully crushed, the processing efficiency is high, and the effect is great. The structure is compact, occupies small area, and is easy to mount.