A stone cutting device is disclosed. A stone cutting device according to an aspect of the present invention is provided to cut a material to be cut by swinging multiple cutting tools by a predetermined angle. Each cutting tool comprises a blade extending in the longitudinal direction of the material to be cut and at least one cutting tip provided on an end of the blade to protrude in the width direction, the cutting tip reciprocating by means of swing movements, thereby cutting the material to be cut. The cutting device comprises a frame unit provided to couple the multiple cutting tools, to cause the cutting tools to reciprocate, and to separately adjust tension of respective cutting tools. The frame unit comprises an actuator for applying tension such that a load of 8-27 tons acts on the cutting tools.