The invention relates to a cross-platform numerical control system, which is technically characterized in that a display screen, a MDI (Multiple Document Interface) keyboard box, a machine tool operation panel box, a soft key box and a hand wheel box are all mounted on a control panel of a case of the cross-platform numerical control system; a control circuit in the case comprises a PCI (Peripheral Component Interconnect) numerical control operation element state scanning main board, an industrial control main board and a motion control card, which are orderly connected in a RS232 mode; the PCI numerical control operation element state scanning main board is connected with the MDI keyboard box, the machine tool operation panel box, the hand wheel box and the soft key box through a serial port, the industrial control main board is connected with the display screen via a VGA (Video Graphics Array) port, and the motion control card is connected with a numerical control machine tool main body through a driver interface and a coder interface. According to the invention, different types of numerical control systems can be reconstructed quickly by replacing the MDI keyboard box, the machine tool operation panel box and the soft key box and changing the function mappings, so that the cross-platform numerical control system has wide market and application prospect in the fields of numerical control system development, function demonstration, simulation, vocational skill training and the like.