To provide a plate material conveying system configured to load plate materials produced by a press work onto a tray at regular intervals, prior to a cleaning process. The plate material conveying system comprises: a feeding section 13 that feeds the plate materials produced by the press work at regular intervals; a storage section 14 that stores the plate materials conveyed sequentially from the feeding section 13; a loading section 15 that loads the plate materials stored in the storage section 14 on the tray opposing thereto at one time; and a discharging section 16 that conveys the tray from a site to be opposed to the storage section 14 to a predetermined site.