Abstract: Aiming at the train driver training system of Beijing Metro Line S1, from the man-machine interface and function, a simulation scheme of low-cost and highly reliable subway train broadcast control box was proposed. Taking the STC15 single-chip microcomputer as the core, through the circuit design, hardware circuit production, software design and debugging, the simulation of broadcast control box was implemented. The simulation broadcast control box has the functions of automatic or manual station announcement, emergency information broadcasting and emergency intercom for passengers. At present, the simulation broadcast control box was applied to the subway train driving simulator.