The invention relates to full-automatic single crystal silicon rod cutting and grinding combined processing integrated equipment and an using method thereof, and the invention provides the full-automatic single crystal silicon rod cutting and grinding combined processing integrated equipment, which can process a round rod into a square rod by integrated processing of square cutting, corner grinding and surface grinding, so that the problems in the prior art can be solved effectively; the type and quantity of the equipment can be reduced, the area of a plant, the labor and logistics cost can besaved when the processing efficiency of the silicon rod is improved, the processing cost of the silicon rod is reduced and the size precision of the crystal rod is improved. The invention can make asquare cutting assembly and a grinding assembly work independently without interference, and the processing efficiency is improved; in addition, a square cutting grinding power head adopts a symmetrical layout, meanwhile double-sided machining is carried out, so the processing efficiency is doubled.