The present invention relates to an apparatus for implementing or controlling an auto-idle function utilizing a starter switch operated for starting a construction machine, in which the start-up is turned on and off, (Engine control unit) for controlling the operation of the engine, a start-on signal or an engine start operation signal set by the operation of the starter switch, and after the engine is started by the engine start operation signal, If the idle state continues, a signal for setting or stopping the engine to the low RPM is output to the ECU. If a change in the work state by the operator is detected while the engine is stopped, it is set by the operation of the previous starter switch And outputs an engine start operation signal to the ECU to perform an auto start function. .
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