Metro train tracking and approaching early-warning system based on active positioning technology

The utility model discloses a metro train tracking and approaching early-warning system based on an active positioning technology. The metro train tracking and approaching early-warning system comprises trackside beacons and vehicle-mounted equipment, wherein the trackside beacons are arranged on a track according to a pre-set distance and are used for sending beacon position ID (Identity) information; the vehicle-mounted equipment is placed inside heads at two ends of a metro train respectively and is used for reading the beacon position ID information and sending metro train position information by a wireless antenna to inform an adjacent back train, or receiving the metro train position information sent by an adjacent front train; and a distance between the back train and the front train is calculated by combining the current position of the back train, and the calculated result is displayed to a train driver. The metro train tracking and approaching early-warning system based on the active positioning technology is independent to a metro train vehicle system and a signal system; the equipment at the two ends work independently to realize respective functions; a moving direction of the metro train does not need to be distinguished and a rapid, safe and effective train tracking and approaching early-warning aim is realized; and trackside equipment is simple, the mounting precision requirement is low and the system is free of maintenance, so that the system is convenient for engineering application on the aspect of software installation and accelerates field implementation.