The object of the present invention is to provide a work sheet processing system wherein the material work sheet can be transported in and the product work sheet can be transporting out efficiently, and the cycle time of the processing can be shortened. The work sheet processing system comprises a work sheet processing machine 3, and a loader 5 for transporting the material work sheet W onto the table 7 of the work sheet processing machine 3 and transporting out the product work sheet M from the table. The loader 5 includes a work sheet holding means 18 comprised of a material work sheet holding tool 19 and a product work sheet holding tool 20. The work sheet processing system further comprises a processing machine control means 31 and a loader control means 32. The processing machine control means 31 controls the work sheet processing machine 3 so that the work sheet processing machine 3 opens an area on the table for the material work sheet W to be transported in by the loader 5, and the product work sheet M to be on standby by being placed within the area the product work sheet holding tool 20 is capable of being transported out. The loader control means 32 controls the loader 5 so that the loader 5 holds onto the product work sheet M, and when the material work sheet M is placed on the table 7, transports out the product work sheet M.