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 tec