The invention discloses a steel plate cutting platform system which comprises a disc-shaped conveying device. A plurality of cutting machines are arranged around the disc-shaped conveying device. A guide mechanism is arranged on the disc-shaped conveying device. The middle of the guide mechanism and the disc-shaped conveying device are in pivotal connection so that the guide mechanism can rotate to correspond to any cutting machine to convey steel plates to any cutting machine. The disc-shaped conveying device comprises a disc-shaped platform, a plurality of universal balls are distributed on the disc-shaped platform, and therefore the steel plates can move in any direction. The multiple cutting machines are arranged around the disc-shaped conveying device, the guide mechanism is arranged on the conveying device and conveys the steel plates to any cutting machine, and when one cutting machine breaks down or needs to be shut down for adjustment, the overall steel plate cutting progress is not affected. Meanwhile, the multiple cutting machines are integrated on one cutting platform system and share the disc-shaped conveying device, so that equipment cost is reduced, and the occupied space is reduced.