Cutting device of silicon rod cutting system and silicon rod cutting system

The embodiment of the utility model provides a cutting device of a silicon rod cutting system and the silicon rod cutting system. The cutting device comprises two oppositely-arranged cutting machine head mechanisms, each cutting machine head mechanism comprises a fretsaw assembly, the fretsaw assembly comprises a fretsaw mounting frame and a diamond wire, the diamond wire is arranged on the front side of the fretsaw mounting frame, and the side, where the diamond wire is mounted, of the fretsaw mounting frame is the front side of the fretsaw mounting frame; the fretsaw mounting frame is a rigid fretsaw mounting frame; the cleaning assembly is fixed on the front side of the fretsaw mounting frame; wherein the cleaning assembly is provided with a plurality of cleaning nozzles, and the cleaning nozzles of the cleaning assembly comprise a first part cleaning nozzle for cleaning the cutting machine head mechanism on the opposite side and the cutting machine head mechanism on the same side and a second part cleanin