The invention discloses a train set approach early-warning system comprising an information acquisition module acquiring station yard indicating information broadcast by an STP system ground main engine and machine debugging position information for interaction between the ground main engine and a train-mounted main engine, a train set position tracking module verifying and checking consistency between the station yard indicating information and the machine debugging position information, and conducting safe and whole-process track to a machine train equipped with an STP vehicle-mounted device, a duty locomotive, a train and launching vehicles according to access conditions, track occupation conditions and train set displacement conditions if the verification passes, and an early-warning module providing early warns to operating people in a train set approach area according to a track result output by the train set position tracking module and the position of the pre-warned working area in the station. A new means can be provided for construction workers and protection workers in the station to access of locomotive information in the station, and working personnel safety can be effectively guaranteed.