Moving block system for train

The invention provides a moving block system for a train, which comprises a ground control center (1) and a train-mounted control unit (2), wherein the train-mounted control unit (2) is communicated with the ground control center (1) through a WiMAX (worldwide interoperability for microwave access) network; the train-mounted control unit (2) is used for collecting the information about the speed and position of the train and sending the information about the speed and position to the ground control center (1); and the ground control center (1) is used for calculating the safety interval between trains according to the received information about the speed and position. According to the invention, the WiMAX network is applied to the moving block system for a train, the real-time smooth information interaction between the ground control center and the equipment mounted on the train used for railway heavy haulage is ensured, and the moving block system is safely and reliably applied to the railway heavy haulage.