According to the present invention, even if the engine is completely started by the driver by operating the ignition key, the surroundings are noisy or the engine sound is weak and the engine is not started yet. It is related to the start motor over-rotation preventing device that stops the start motor by automatically shutting off the start circuit when the start is applied to prevent the operation.;The start motor over-rotation prevention device of the present invention is installed on any one part of the engine and the circuit breaker (4) installed on the power supply line to the start motor (3) to detect the vibration of the engine and the electric signal It characterized in that it comprises a vibration sensor (5) to be output to the circuit breaker (4).
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