The invention provides a stone crushing device. The stone crushing device comprises guide rails and a movable block; the two guide rails are fixed in parallel; the movable block is arranged on the guide rails and moves along the guide rails; hanging rings are fixed at the upper ends of the two sides of the movable block; the central axes of the hanging rings are perpendicular to the guide rails onthe vertical plane; the hanging rings overlaps the guide rails on the vertical projection; upper wheel discs are arranged above the end parts of the guide rails; lower wheel discs can be coaxially fixed to the lower parts of the upper wheel discs in a rotating mode; two L-shaped hanging blocks are fixed at the bottoms of the lower wheel discs; wire winding motors are fixed on the planes of the hanging blocks; output shafts of the wire winding motors are fixedly provided with wire winding discs; and central axes of the wire winding discs are parallel to the guide rails and are located right above the guide rails. The stone crushing device has the advantages that the movable block, cutters, a baffle and other structures are arranged, so that crushing can be carried out in an advancing operation mode, integration is facilitated, and automatic control is facilitated.