To provide an automatic plate material sorting system and method for performing sortation in next processes and in orders without increasing a sorting space.

After receiving production instructions from a production control system 11, a product loading position determining function 2 refers to a product information database 12 and outputs loading position information showing the positions of loading plate material products on trucks 5 arranged in an accumulation area 4 to an automatic cutting and machining means 13. An accumulation device 36 attracts the plate material products 6 cut by a cutting installation 34 of the automatic cutting and machining means 13 and loads them on the loading position on the trucks 5. In each loading area, the plate material products different in sizes are loaded.