The invention discloses a safety computer output control system comprising a double-coil relay provided with a coil A and a coil B. The coil A and the coil B drive the double-coil relay in a parallelmanner, so that the relay outputs a signal needed for driving an external device. Besides, the system also includes an output control A-system unit, an output control B-system unit, and a main/standbyswitching module; the output control A-system unit and the output control B-system unit carry out outputting simultaneously and drive the coil A and the coil B respectively; and the main/standby switching module is used for selecting one of the output control A-system unit and the output control B-system unit as a main system/standby system and feeding back a result to all systems. Therefore, thesystem reliability is improved substantially; the relay state detection and alarm mechanism are enhanced; and the fault repairing and maintenance are carried out conveniently.