Feeding device, feeding method and rolled plate machining system

The invention discloses a feeding device, a feeding method and a plate rolling machining system, and relates to the technical field of plate rolling equipment. The feeding device comprises a feeding platform, a positioning mechanism and a pushing mechanism, the feeding platform comprises a supporting table top used for supporting plates, the supporting table top comprises a feeding side and an opposite discharging side in the first direction, and the discharging side is used for being connected with an inlet of the plate rolling machine; the positioning mechanism is arranged on the feeding platform and located on the discharging side, and the positioning mechanism is used for positioning a plate; the pushing mechanism is arranged on the feeding platform and used for pushing the plate to move towards the discharging side in the first direction. According to the feeding device, positioning and automatic feeding of the plate can be achieved, the positioning precision is high, manual participation is not needed i